• Journal of Nutrition and Health
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• v.41 no.7
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• pp.612-620
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• 2008

This study assessed the effects of soy isoflavones supplementation with exercise on urinary mineral (calcium, magnesium, copper, zinc) excretion as an index of bone resorption rates in 67 postmenopausal women. A total subjects were assigned to Isoflavone (90 mg/day) or placebo groups. These groups were further divided into groups that undergone a regular exercise or a rather sedentary state performing daily activity only. We conducted study eight week period. Result showed urinary zinc excretion was more significantly decreased in the isoflavone-sedentary group ($-180.76\;{\pm}\;171.30\;ug/day$) than in the placebo-sedentary group ($-31.23\;{\pm}\;146.60\;ug/day$), placebo-exercise group ($40.93\;{\pm}\;193.44\;ug/day$) and isoflavione-exercise group ($-1.21\;{\pm}\;160.61\;ug/day$) (p < 0.05), but no significant changes in the differences between the values of the pre and post study values in urinary calcium, magnesium and copper excretion. These results suggest that Isoflavone supplementation decrease urinary zinc excretion rate in postmenopausal subjects.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.7
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• pp.140-148
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• 2017

The purpose of this study was to examine the effects of acute aerobic exercise at different intensities on the blood pressure, blood lipids and fibrinolytic markers in pre-hypertension college-aged males. Six subjects performed an acute running exercise at three different intensities(low intensity(LI): 50-60% heart rate reserve(HRR), moderate intensity(MI): 60-70%HRR, and high intensity(HI): 70-80%HRR). The blood pressure(systolic(SBP) and diastolic blood pressure(DBP), blood lipids(total cholesterol(TC) and high-density lipoprotein cholesterol(HDL-C)) and fibrinolytic markers(tissue plasminogen activator(tPA) and plasminogen activator inhibitor-1(PAI-1)) were determined before(PRE), immediately after(POST) and 60minutes after the exercise(60 POST). Results: the SBP in the LI group was significantly increased at POST(p=0.013). The ES levels for the SBP in the MI and HI groups were reduced (-1.33 and -1.23, respectively), though the differences were not significant. The HDL in the MI(p=0.003) and HI(p=0.002) groups were significantly increased at 60 POST. Also, the tPA in the MI(p=0.021) and HI(p=0.042) groups were significantly increased at POST.

• Journal of Nutrition and Health
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• v.48 no.2
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• pp.149-156
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• 2015

Purpose: This study examined the effects of combined intervention of isoflavones and exercise on bone mineral density, bone mineral content, and biochemical bone markers. Methods: Forty rats were divided into four groups; Control, Isoflavones (IF), Isoflavones + Running (IFR), and Isoflavones + Swimming (IFS). All of the rats in this study were fed an experimental diet and deionized water ad libitum for nine weeks. Bone mineral density (BMD) and bone mineral content (BMC) were estimated using PIXImus (GE Lunar Co, Wisconsin.) in spine and femur nine weeks after feeding or training. Results: The combined intervention did not affect weight gain, mean food intake, or food efficiency ratio. The serum concentrations of ALP and osteocalcin were not significantly different by combined intervention. The urinary DPD crosslinks values were not significantly different by combined intervention. There were no significant differences in serum PTH, calcitonin, and estradiol among all groups. Spine BMD, spine BMC and femur BMC were not significantly different by combined intervention. However, femur BMD was significantly higher in the IFR group than in the control group. Compared with the control group, spine BMD, spine BMC, and femur BMD per weight were markedly increased in the isoflavones supplementation and combined intervention group. In addition, femur BMC per weight was significantly higher in the IFS group than in the control group. Compared with the isoflavones supplemented group, BMD and BMC were not significantly different by combined intervention. Conclusion: It can be concluded that isoflavones supplementation or combined intervention of isoflavone and exercise had a beneficial effect on spine and femur peak bone mass in growing female rats.

• Journal of the Korean Society of Marine Environment & Safety
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• v.29 no.5
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• pp.445-455
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• 2023

Sea level rise due to global warming is accelerating. According to the IPCC survey, the expected sea level rise in 2100 was analyzed to be 47cm in the low-carbon scenario (SSP 1-2.6) and 82cm in the high-carbon scenario (SSP 5-8.5). Sea level rise can cause serious damage to port infrastructure and reduce the safety of ships docked inside ports. In this study, Mokpo Port, which frequently suffers from flooding during high tide, was selected and the sensitivity of mooring evaluation factors was analyzed for actual berthing ships according to sea level rise scenarios. From the analysis, we found that the tension of mooring line, the load of bollard, vertical angle of mooring line, and ship's motion of 6-DOF, which are evaluation factors, generally increased when the sea level increased. The most sensitive evaluation factor was sway motion of 6-DOF. Also, we analyzed that the value of mooring evaluation factors decreased when the crown height was raised. This was beneficial in improving ship and pier safety. The results of this study can be used as basic data to secure measures to improve port and ship safety according to sea level rise in Mokpo Port.

• Proceedings of the KSME Conference
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• 2007.05b
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• pp.3015-3020
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• 2007

An experimental study of the dynamic characteristics of the free rising oblate spherical bubble is investigated. As noted by Saffman, the characteristics of the spiral motion are defined with parameters of the spiral frequency, spiral radius, and rising velocity. High speed camera recorded every detail information of free rising bubble. The spiral number, the bubble rise velocity, and the angular velocities were measured for the bubble size between 1.0mm to 20.0mm in diameter. In order to make clear trajectory, we employed the Fast Fourier Transformation for the normal digital camera data to synchronize with the high speed camera data. It was found that the spiral number suggested here was monotonically decreased as the bubble size increases. The present observation, however tells us that previous Saffman's formulation shows a good agreement with the trend, but over estimated spiral number. Therefore, it is recommended that Saffman's theoretical study is needed to be improved.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1994.04a
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• pp.194-194
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• 1994

후시상하부의 choline성 수용체는 혈압상승 조절작용에 관여하는 것으로 보고되었다. 그러나 후시상하부는 심혈관계의 중추조절 분만 아니라 호흡, 체온 및 운동등의 중추조절에 중요한 역할을 하는 것으로 보고된 바 있으므로, 후시상하부의 일차적인 심혈관 조절작용을 규명하기 위해서는 호흡, 체온, 운동상태등을 일정하게 유지하게 유지한 조건에서 실험을 시행하여야 된다고 사료된다. 따라서 마취하고 호흡 및 체온을 일정하게 유지한 흰쥐에서 후시상하부의 choline성 수용체에 의한 혈압조절 작용을 규명하고자 본 연구를 실시하였다. 또한 후시상하부의 choline성 기정에 의한 심혈관 조절작용과 교감신경 활성의 척도인 혈장 catecholamine 농도의 상관성을 알아 보고자 하였다.

• Journal of Veterinary Clinics
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• v.32 no.1
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• pp.45-48
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• 2015

The purpose of this study was to select high-quality boar semen after the glass wool filtration of extended boar semen. After collecting boar semen, its concentration, morphology, viability, and motility were examined according the glass wool's height and time. After glass wool filtration, the sperm concentration decreased, but the proportion of normal sperms and the sperm viability increased. Nevertheless, the sperm motility showed no changes. The above results showed that the glass wool filtration of boar semen is a method of obtaining sperms with relatively low abnormal rates and high viabilities.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.2005-2006
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• 2008

심박변이도는 자율신경계의 균형 상태를 나타내는 중요한 지표이다. 동적인 환경내에서 항상성을 유지할려는 인체가 각 신경계를 조율하는 수치로 심박의 변화를 시간영역과 주파수영역으로 나누어 그 값을 측정하여 분석하였다. 그 중 심전도의 측정방식에서 간략히 하고자 광학적 방법으로 심장의 박동을 측정하는 PPG 변화량이 심박변이도와 유사하다는 연구가 진행되어 왔다. 하지만, 심전도와 PPG 는 혈압의 영향을 받는다. 본 연구에서 운동부하 실험을 주어 혈압을 상승 시킨뒤, 심전도를 통해 산출한 심박변이도와 PPG를 통해 산출한 맥박변이도를 비교하여 두 상관성에 대하여 연구하였다.

• Proceedings of the KIEE Conference
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• 2000.11c
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• pp.516-518
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• 2000

정상 상태의 gas-insulated switchgear (CIS) 내부에서 발생한 부분방전 신호를 검출 할 수 있는 UHF 부분방전 검출 센서를 실험용 362 kV GIS에 적용하였다. GIS 내부에 알루미늄 이물질을 투입한 다음 120 - 180 kVrms 전압을 단계적으로 인가하고 장시간 인가전압 위상에 대한 UHF 부분방전 신호를 측정하였다. 인가전압을 높일수록 검출된 방전신호의 간격이 늘어났으며, 이물질로 사용한 알루미늄선의 길이가 길어질수록 이물질의 상승고도는 증가하였다. GIS 내부에서 이물질의 운동에 대한 간단한 계산에서도 비슷한 경향을 보임을 확인하였다.

• The Journal of the Acoustical Society of Korea
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• v.5 no.2
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• pp.29-38
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• 1986

본 논문은 분극처리된 PZT 압전 세라믹 소자의 물리, 음향학적 제 특성이 시간의 함수로 나타 나는 시효현상을 다루고 있다. SrCO\sub 3\, NiO 및 Fe\sub 2\O\sub 3\를 소량 첨가하여 직접 제조한 PZT 세라믹은 분극처리 후, f\sub r\ 은 증가하는 시효현상을 보여주었다. 시효현상 기구의 이해를 위하 여 이중 포텐샬우물 모델을 이용하였으며, 외부에서 가한 응력, 역방향 전장 및 온도상승에 따라 분극현 상을 나타내었다. 시효현상의 주 원인은 분극처리시 전장 방향으로 분역들이 정렬되면서 내부에 저장되 었던 잔유응력의 이완에 의한 분역계면의 운동에 있음을 간접적으로 확인하였다. 이러한 분역계면의 운 동은 열적 활성화 에너지를 갖는 시간에 의존하는 운동으로써 분극의 감소를 유발하며, 이것이 시효현 상으로 나타나는 것으로 사료된다.