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( Hyejoon Park ),( Wonil Park ),( Moran Lee ),( Nayoung Ko ),( Eunkyung Kim ),( Kazuko Ishikawa-takata ),( Jonghoon Park ) 한국운동영양학회 2018 Physical Activity and Nutrition (Phys Act Nutr) Vol.22 No.1
[Purpose] The purpose of this study was to investigate the relationship of various aspects of daily physical activity, such as the number of steps, time spent in moderate to vigorous intensity physical activity (MVPA), and locomotive and non-locomotive MVPA measured by a triaxial accelerometer, with the functional fitness in healthy elderly men. [Methods] The subjects of this study were 22 healthy elderly men aged over 65 years. The participants wore a triaxial accelerometer for two weeks to estimate their daily physical activities. The level of functional fitness was measured based on "National Fitness Award 100 in Korea" immediately after the measurement of two weeks of daily physical activities. [Results] The results showed that active healthy elderly men with more than 6,500 walking steps per day and more than 60 min per day spent in MVPA showed a significantly higher 2-min marching in place and index of cardiorespiratory endurance compared to less physically active participants. Particularly, locomotive MVPA was significantly associated with cardiorespiratory endurance levels (r = 0.50), whereas non-locomotive MVPA was not associated with other measurements of functional fitness. [Conclusion] Increased MVPA time, especially the locomotive MVPA, can effectively suppress the decrease in cardiorespiratory endurance level in elderly men. However, no association was observed between non-locomotive MVPA, such as household activities, and functional fitness in healthy elderly men.
( Sinwook Lee ),( Gyuseog Hong ),( Wonil Park ),( Jaeseong Lee ),( Nahyun Kim ),( Hyejoon Park ),( Jonghoon Park ) 한국운동영양학회 2020 Physical Activity and Nutrition (Phys Act Nutr) Vol.24 No.1
[Purpose] The purpose of this study was to investigate the effects of short-term creatine intake on muscle fatigue induced by resistance exercise in healthy adolescent men, i.e., lactic acid concentration and wrist and head tremor measured by an accelerometer. [Methods] Twelve healthy adolescent men who had no experience with creatine intake were included. The subjects were randomly assigned to the creatine group and the placebo group, followed by 5 days of creatine and placebo intake, and 5 times of 5 sets of leg press, leg extension, bench press, and arm curl exercises at 70% repetition maximum (RM). The lactic acid concentration before and after exercising, rate of perceived exertion (RPE), and accelerometer-based wrist tremor and head tremor during exercise were measured. Subsequently, after 7 days to allow for creatine washout, the same exercise treatment and measurement were performed in each group after switching drug and placebo between the groups. [Results] The level of lactic acid before and after the acute resistance exercise trial was significantly lower in the creatine group than in the placebo group (P <0.05). The mean RPE during the resistance exercise was significantly lower in the creatine group than in the placebo group (P <0.05). There was no difference between the two groups in the mean wrist tremor during resistance exercise, but the mean head tremor values were significantly lower in the creatine group than in the placebo group in the arm curl, the last event of the exercise trials (P <0.05). [Conclusion] Short-term creatine intake reduces the blood fatigue factor increased by resistance exercise, and is thought to suppress fatigue, especially in the latter half of resistance exercise. Therefore, these findings indicate that short-term creatine intake can have an improved effect on anaerobic exercise performance.
Park, Sunghoon,Kheel, Hyejoon,Sun, Gun-Joo,Ko, Taegyung,Lee, Wan In,Lee, Chongmu Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>Fe2O3-decorated CuO nanorods were prepared by Cu thermal oxidation followed by Fe2O3decoration via a solvothermal route. The acetone gas sensing properties of multiple-networked pristine and Fe2O3-decorated CuO nanorod sensors were examined. The optimal operating temperature of the sensors was found to be 240°C. The pristine and Fe2O3-decorated CuO nanorod sensors showed responses of 586 and 1,090%, respectively, to 1,000 ppm of acetone at 240°C. The Fe2O3-decorated CuO nanorod sensor also showed faster response and recovery than the latter sensor. The acetone gas sensing mechanism of the Fe2O3-decorated CuO nanorod sensor is discussed in detail. The origin of the enhanced sensing performance of the multiple-networked Fe2O3-decorated CuO nanorod sensor to acetone gas was explained by modulation of the potential barrier at the Fe2O3-CuO interface, highly catalytic activity of Fe2O3for acetone oxidation, and the creation of active adsorption sites by Fe2O3nanoparticles.</P>
Park, Sunghoon,Sun, Gun-Joo,Kheel, Hyejoon,Lee, Wan In,Lee, Sangmin,Choi, Seung-Bok,Lee, Chongmu Elsevier 2016 Sensors and actuators. B Chemical Vol.227 No.-
<P><B>Abstract</B></P> <P>n-In<SUB>2</SUB>O<SUB>3</SUB> nanorods codecorated with n-Fe<SUB>2</SUB>O<SUB>3</SUB> and p-Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles were synthesized by the thermal evaporation of In<SUB>2</SUB>S<SUB>3</SUB> powders in an oxidizing atmosphere followed by the solvothermal deposition of Fe<SUB>2</SUB>O<SUB>3</SUB> and Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles, and their ethanol gas sensing properties were examined. The p-Co<SUB>3</SUB>O<SUB>4</SUB>-decorated n-In<SUB>2</SUB>O<SUB>3</SUB> nanorods exhibited stronger and faster response to ethanol gas than the n-Fe<SUB>2</SUB>O<SUB>3</SUB>-decorated n-In<SUB>2</SUB>O<SUB>3</SUB> nanorods due to the larger modulation of the conduction channel width and interfacial potential barrier height, and stronger catalytic activity of p-Co<SUB>3</SUB>O<SUB>4</SUB> than n-Fe<SUB>2</SUB>O<SUB>3</SUB>. Furthermore, the codecorated In<SUB>2</SUB>O<SUB>3</SUB> nanorod sensor exhibited significantly stronger and faster response to ethanol gas than its mono-oxide nanoparticle-decorated counterparts under the condition of the same total amount of the decorating nanoparticles. The origin of the synergistic effects of codecoration on the ethanol sensing properties of the In<SUB>2</SUB>O<SUB>3</SUB> nanorod sensor is not the formation of compounds or nanoalloys between the oxides but the formation of a large number of the p–n junctions between the two different types of decorating oxides, i.e., Fe<SUB>2</SUB>O<SUB>3</SUB>–Co<SUB>3</SUB>O<SUB>4</SUB> p–n junctions in addition to the Co<SUB>3</SUB>O<SUB>4</SUB>–In<SUB>2</SUB>O<SUB>3</SUB> p–n junctions.</P>
Park, Sunghoon,Kim, Soohyun,Kheel, Hyejoon,Lee, Chongmu Elsevier 2016 Sensors and actuators. B, Chemical Vol.222 No.-
<P><B>Abstract</B></P> <P>ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> (ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> =4:1) composite nanoparticles were synthesized via a facile solvothermal route. The 4:1 ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> composite nanoparticle network sensor showed significantly enhanced NO<SUB>2</SUB> gas sensing performance compared to its pure ZnO nanoparticle sensor counterpart. The ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> composite nanoparticle sensor showed responses of 346–1602% to 0.1–5ppm of NO<SUB>2</SUB> at room temperature under UV illumination at 3.7mW/cm<SUP>2</SUP>, whereas ZnO nanoparticle sensors showed responses of 264–707%. The former also showed faster response to NO<SUB>2</SUB> gas and higher selectivity to NO<SUB>2</SUB> gas than the latter. The responses of the sensors to NO<SUB>2</SUB> increased with increasing UV illumination intensity. In addition, the underlying mechanism for the enhanced sensing performance of the ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> composite nanoparticle sensor toward a strong oxidizing gas NO<SUB>2</SUB> under UV illumination was examined. Particular emphasis was placed on the role of the p/n junction in the composite nanoparticle sensor.</P>
Acetone Gas Sensing Properties of NiO Particle-Decorated TeO<sub>2</sub> Nanorod Sensors
Park, Sunghoon,Sun, Gun-Joo,Kheel, Hyejoon,Choi, Seungbok,Lee, Chongmu American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.8
<P>TeO2 nanorods decorated with NiO nanoparticles were synthesized by the thermal evaporation of Te powder followed by solvothermal deposition of NiO and their acetone gas sensing properties were examined. The pristine and NiO-decorated TeO2 nanorods exhibited responses of similar to 262% and similar to 601%, respectively, to 500 ppm acetone at 125 degrees C. The pristine and NiO-decorated TeO2 nanorod sensors showed the strongest response to acetone gas at 150 degrees C and 125 degrees C, respectively. The NiO-decorated TeO2 nanorod sensor showed selectivity to acetone gas over other volatile organic gases such as methane, toluene, benzene, and LPG at 125 degrees C. The underlying mechanism for the enhanced response of the NiO-decorated TeO2 nanorod sensor to acetone gas is discussed.</P>
Sunghoon Park,Hyejoon Kheel,Gun-Joo Sun,Hyoun Woo Kim,Taegyung Ko,Chongmu Lee 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.4
Cr2O3-functionalized Nb2O5 nanoparticles were synthesized via a facile hydrothermal route. The multiple-networked Cr2O3-functionalized Nb2O5 nanostructured sensor showed enhanced H2 gas sensing performance compared to its pristine Nb2O5 nanostructure counterpart. The Cr2O3-functionalized Nb2O5 nanostructure sensor showed responses of 5.24 to 2 ppm of H2 at room temperature, whereas the pristine Nb2O5 nanoparticle sensors showed responses of 2.29. The former also exhibited a faster response to H2. The multiple-networked pristine and Cr2O3-functionalized Nb2O5 nanostructured sensors were stronger and much shorter, respectively, than other nanomaterial-based Schottky diode-type sensors and Nb2O5-based Schottky diode-type sensors. The underlying mechanism for the enhanced sensing performance of the Cr2O3-functionalized Nb2O5 nanostructured sensor towards H2 gas is discussed in detail. Particular emphasis is placed on the role of the Cr2O3-Nb2O5 p-n junction in the Cr2O3-functionalized Nb2O5 nanostructure sensor.