지표환경에서의 마그네슘 동위원소 분별

류종식 대한지질학회 2019 지질학회지 Vol.55 No.6

With the advent of analytical technique and mass spectrometry, non-traditional stable isotopes have been widely used in earth and environmental sciences. However, little studies have been conducted in South Korea. Magnesium (Mg) isotopes can be used as a tracer for understanding global climate change, seawater chemistry and nutrient cycling in soil. To this end, Mg isotope fractionation during geological Mg cycling should be quantified. This review introduces major factors (primary mineral dissolution, secondary mineral formation, adsorption, plant uptake and carbonate mineral precipitation) causing Mg isotope fractionation during surficial processes. This review also introduces the principle of Mg isotopes and analytical methods. Finally, recent studies are reviewed in order to see how and to what extent Mg isotope fractionation would occur according to each factor. 최근 분석법 및 질량분석기의 발달로 인해 비전통 안정동위원소의 지구과학적 활용이 두드러지지만, 이에대한 국내에서의 활용은 미진한 실정이다. 마그네슘 동위원소는 전 지구적 탄소순환, 해수 화학, 양분순환(nutrient cycling)을 이해하는 지시자로 활용될 수 있으며, 이를 위해서는 Mg 순환과정 중 발생하는 동위원소분별에 대한 이해가 선행되어야 한다. 따라서 본 논평에서는 지표환경에서 마그네슘 동위원소 분별을 일으키는요인(주요 광물 용해, 이차광물 생성, 흡착, 식물 섭취 및 탄산염 광물 침전)에 대하여 소개하고자 한다. 먼저 마그네슘 동위원소의 개념, 질량분석기를 활용한 분석법을 살펴보고 마지막으로 최근 연구결과를 통한 지표환경에서 마그네슘 동위원소 분별을 일으키는 요인 및 기작에 대하여 살펴보고자 한다.

초등학생의 신체활동량 특성 분석

류종식,강호율 한국초등체육학회 2019 한국초등체육학회지 Vol.25 No.1

The Purpose of this stud was to determine the physical activity characteristics of elementary school students using a pedometer. For this purpose, 102 third grade (50 boys, 52 girls) and 157 sixth grade (89 boys, 68 girls) students voluntarily participated in this investigation. PE-105 (Sinwoo Electronics, Korea) pedometers were used to record daily step counts. Students wore pedometers for seven days, including weekends, except while sleeping and taking shower or bath. The methods of Tudor-Locke & Myers(2001) were accepted for the determination of daily physical activity in this study.. The result of this study are as follows; 1) There was a significant difference between the grades (F=6.948, p<.01), and gender (F=31.104, p<.001.) There was also a significant difference in the interaction between gender and grade (F=4.19, p<.05). Post-testing showed that boys in sixth grade were significantly higher than boys in third grade, and boys in third grade were significantly different from girls in sixth grade. However, there was no significant difference between sixth and third grade. 2) There was a significant difference in the physical activity during the week and weekends in both the third (F=13.662, p<.001) and sixth grades (F=65.963, p<.001). 3) There was a significant difference between the grade (F=16.685, p<.001) and gender (F=36.109, p<.001) for the weekly physical activity, but only in the case of the weekend physical activity there was a significant difference between the sexes (F=8.312, p<.01). In conclusion the average daily physical activity rate of elementary school students was about 11,000 steps/day. Boys have more physical activity than girls, and the upper grades have more physical activity than the lower grades. Also, there was less physical activity on weekend than on weekday. Thus, we should develop physical activity programs for girls and weekend physical activity programs to ensure sufficient physical activity for their health. 본 연구는 보수계를 이용하여 초등학생의 신체활동량 측정 후 분석하여 그 특성을 알아보고자 함에 있다. 이를 위해 G시에 위치한 초등학교 3학년 102명(남자 50명, 여자 52명)과 6학년 157명(남자 89명, 여자 68명)이 자발적으로 본 연구에 참여하였다. 연구대상자들은 잠을 자거나 씻는 시간을 제외하고 항상 보수계를 착용하였으며, Tudor-Locke & Myers(2001)가 제안한대로 주말 이틀을 포함한 일주일 동안 연구대상자들의 신체활동량을 측정하였다. 측정된 결과는 이원배치분산분석(two-way ANOVA)을 실시하였으며, 상호작용이 나타났을 경우 사후검증을 실시하였다. 본 연구를 통해 얻어진 결과는 다음과 같다. 첫째, 초등학생의 신체활동량을 분석한 결과 일일 평균 신체활동량은 약 11,000steps/day 수준으로 나타났다. 둘째, 초등학생의 남녀 간 신체활동량 차이를 분석한 결과 남학생의 신체활동량이 여학생의 신체활동량 보다 높게 나타났다. 셋째, 초등학생의 학년 간 신체활동량의 차이를 분석한 결과 6학년의 신체활동량이 3학년의 신체활동량 보다 높게 나타났다. 넷째, 초등학생의 주중과 주말 신체활동량을 분석한 결과 주중 신체활동량이 주말 신체활동량 보다 높게 나타났다. 결론적으로 남학생보다 여학생이, 고학년보다 저학년의 신체활동량이 낮게 나타났으며, 주중에 비해 주말의 신체활동량이 부족하다는 것을 알 수 있었다. 따라서 본 연구의 결과를 바탕으로 초등학생의 건강과 체력 증진을 위한 충분한 수준의 신체활동량을 확보하기 위해 여학생을 위한 신체활동프로그램과 주말 신체활동프로그램을 개발해야 한다고 사료된다.

Characterization of Ok-dong river water, tributary of the South Han River, using multi-isotopes

류종식,이광식,허중혁,신형선,안규홍,장호완 대한지질학회 2005 대한지질학회 학술대회 Vol.2005 No.

다검출기 유도결합 플라즈마 질량분석기를 이용한 대전지역 지하수의 우라늄과 스트론튬 동위원소 특성 연구

류종식,신형선,한정희,이광식,장호완 대한지질학회 2005 대한지질학회 학술대회 Vol.2005 No.

암석 및 해수 표준시료에 대한 리튬(Li) 동위원소 분석

류종식,길영우,신형선,장아람 대한지질학회 2008 대한지질학회 학술대회 Vol.2008 No.

Hydrochemistry and isotope geochemistry of Song Stream, a headwater tributary of the South Han River, South Korea

류종식,Kwang-Sik Lee,Ho-Wan Chang 한국지질과학협의회 2007 Geosciences Journal Vol.11 No.2

To investigate the geochemical and isotopic characteristics of a headwater tributary of the South Han River, we analyzed major elements, stable isotopes of oxygen, hydrogen, carbon, and sulfur, and strontium (Sr) isotopes of stream and groundwater samples collected from the Song Stream watershed in summer 2003. The stream water samples of the study area were divided into three water types, among which dissolved ion concentrations differed considerably. Our results strongly indicate that the chemical composition of Song Stream is controlled by silicate and carbonate weathering, as well as anthropogenic contamination, and variations in major dissolved ions and Sr isotopic ratios are mainly correlated to lithological variations in the watershed. The dissolved loads of the main channel of Song Stream are largely controlled by carbonate dissolution. Thus, the water chemistry of the main channel is probably dominated by the chemical weathering of carbonates, even where carbonates comprise only a minor proportion of the bedrock geology. The Sr isotopes and Mg/Ca molar ratios indicate that a dolomite end-member may exist in the study area, which would be compatible with the cationic characteristics of Song Stream. All groundwater samples from the study area, except for one, had significantly high nitrate concentrations (0.75–2.42 mmol/L) that exceeded the drinking-water standard and possibly resulted from both sewage and agricultural inputs.

탈착용 종아리 압박 기구 착용이 여자 대학생들의 등속성 운동 시 하지 근기능에 미치는 영향

류종식(Ryu, Jong-Sik),김차룡(Kim, Cha-Ryong),송남석(Song, Nam-Seok),김상영(Kim, Sang-Yeong),황강민(Hwang, Kang-Min),채원식(Chae, Won-Sik),김종근(Kim, Jong-Geun) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.6

The purpose of this study was to investigate the effect of muscular strength and muscle endurance on the isometric and isokinetic muscular strength of calf compression equipment. The subjects were selected among 18 college students who had no ankle related disorder among 20 subjects. All subjects measured ROM, maximum torque (Peak Torque), and total work of the ankle according to the presence or absence of the compression mechanism. Muscle strength test showed that the peak torque(Nm). Dorsi flexion was 33.41 ± 4.35Nm, 34.66 ± 4.45Nm, and plantar flexion was 120.94 ± 42.24Nm at the lower flexion, respectively, which was not significantly different from 123.97 ± 31.5Nm. Muscle endurance test showed that the total work(Nm). dorsi flexion was lowered from 82.22 ± 8.03Nm to 80.27 ± 7.93Nm, but there was no significant difference. On the other hand, plantar flexion was 237.05 ± 93.64 Nm and 255.94 ± 84.23 Nm, respectively (p<.05). These results suggest that wearing a calf compression equipment and dorsiflexion and flexion exercises will increase the range of static joint motion and improve strength and muscle endurance. In order to improve the ankle joint"s muscular function, Exercise seems to have a positive effect.

고강도 운동 시 식이형태가 혈중 그렐린과 렙틴에 미치는 영향

류형수(Ryu, Hyung-Soo),정현령(Jung, Hyun-Lyung),강호율(Kang, Ho-Youl),류종식(Ryu, Jong-Sik) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.4

The purpose of this study was to determine the effects of the difference between high carbohydrate diet(the traditional Korean diet pattern; KFG) and high fat diet(the traditional Western diet pattern; WFG) on plasma ghrelin and leptin responses in 3-day high-intensity aerobic exercise. The college male students were voluntary participated in this investigation(N=18). Each subject was belonged to either KFG group(n=9) and WFG(n=9). All subjects received 3,000 kcal meal per day in either KFG or WFG for 3 days. The subjects performed treadmill running at the 70% VO2max for 60min on Day1 Day 2 and Day3. Fasting blood samples were drawn from forearm vein and analyzed for lactate, glucose, insulin, leptin, triglyceride, free fat acid(FFA) and ghrelin. Plasma ghrelin levels in KFG were significantly lower than that of WFG on Day 4 (p<.05), but leptin levels were not. Plasma lactate concentrations in KFG was significantly higher than those in WFG (p<.05). Plasma glucose, insulin, triglyceride and FFA levels were not significantly different between KFG and WFG. Therefore, the results of the current study suggest that the high carbohydrate meal like KFG have positive effects on decreasing plasma ghrelin that lessens hunger sensation.

12주간 소도구 조작운동이 발달장애아동의 기초체력 및 주의력집중에 미치는 영향

류종식(Ryu, Jong-Sik),이명지(Lee, Myungji),김종근(Kim, Jong-Geun),정해룡(Jung, Hae-Roug),김예영(Kim, Yae-Young) 한국코칭능력개발원 2019 코칭능력개발지 Vol.21 No.2

초등학생의 신체활동이 신체조성, 혈압 및 기초체력에 미치는 영향

류종식(Ryu, Jong-Sik),강호율(Kang, Ho-Youll) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.2

The purpose of this study was to investigate the effects of physical activity on body composition, blood pressure and physical fitness in elementary school students. For this purpose, 157 sixth graders (89 boys, 68 girls) voluntarily participated in this experiment. Students wore pedometers for seven days, including weekend, except while sleeping and taking shower or bath. Also BMI, WHR, %body fat, blood pressure, muscular strength, muscle endurance, muscular power, flexibility, and Vo2max were measured. The result are as follows. 1) Analysis of body composition by physical activity level showed a significant difference between BMI (p<.01), WHR (p<.01), body fat (p<.01) for boys and BMI (p<.01), body fat (p<.01) for girls. 2) Blood pressure did not show a significant difference depending on the level of physical activity for boys. On the other hand, the girls had significant differences in their systolic blood pressure (p<.05). 3) Analysis of physical fitness by physical activity level showed the there is a significant difference between muscle endurance (p<.001), muscular power (p<.001), flexibility (p<.05), Vo2max (p<.001) for boys and muscle endurance (p<.001), muscular power (p<.05), Vo2max (p<.001) for girls. Physical activity is judged to have a positive effect on healthy body composition, control blood pressure, and improving physical fitness. Therefore, it is important to ensure sufficient physical activity for growing children.