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허성훈(Sunghoon Hur),김현수(Hyun Soo Kim),송현철(Hyun-Cheol Song) 한국세라믹학회 2021 세라미스트 Vol.24 No.3
Wireless energy transfer (WET) is the transmission of electric power without any physical connections such as wires. Currently, inductive coupling mediated by electromagnetic (EM) waves is the most common method of WET and is widely used to charge portable devices such as smartphones, Bluetooth earphones, electric shavers, and visual prostheses. However, its application is still limited due to a number of issues including low efficiency, short charging distance, heating problem, and limited choice of transmission medium. Due to these issues, EM-based WET cannot be applied to implantable medical devices, marine cable operation sensors, and electronic devices with electromagnetic interference shielding. Recently, as an alternative to EMbased WET, acoustic energy transfer mediated by sound waves becomes more attractive. Ultrasound offers advantages for transmission in dense media such as liquids or solids and is regardless of electromagnetic shielding. In this review, we investigate recent progress in acoustic power transfer technology in terms of acoustic energy conversion mechanism and provide the future research direction of acoustic power transfer technology.
허성훈(Sung Hoon Hur),김보흠(Bo Heum Kim),이상준(Sang Joon Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this study, we investigated experimentally the effect of fluid viscosity on the performance of a serial-connected valveless micropump (SCV micropump) fabricated by a conventional MEMS fabrication process. The micropump consists of serial-connected two pump chambers with identical chamber volume and three diffuser valves. A piezoelectric disc was bonded on the chamber using epoxy resin. The performance of the SCV micr opump was investigated with varying fluid viscosity from 1.04 mPa?s to 2.28 mPa?s. For low fluid viscosities, the double chambers operation of the micropump has lower pump power, compared to the single chamber o peration. However, reciprocal results are obtained for the cases of high fluid viscosities. The present experime ntal results show that fluid viscosity is an important factor in the pumping performance of a SCV micropump.
Perilipin 단백질과 근육 내 중성지방의 상호작용이 PPARβ/δ발현에 미치는 효과
허성훈(Hur, Sung-Hoon),안경준(An, Kyung-Jun),이종삼(Lee, Jong-Sam) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.4
PURPOSE: We investigated interaction of perilipin protein and intramuscular triglyceride on expression of PPARβ/δin rat skeletal muscle. METHOD: A total of thirty-six male Sprague-Dawley were used in the study. Rats were divide into three groups: control (n=12), fasted (n=12), aerobic exercise (n=12). Aerobic exercise consist of 2-h (30 min × 4 cycle) swimming exercise and fasting included 18-h with only water. We determined intramuscular triglyceride (IMTG) content, perilipin (PLIN3, PLIN5) and PPARβ/δprotein expression, citrate synthase (CS), β-hydroxyacyl-CoA dehydrogenase (β-HAD) activity. RESULTS: Our analyses indicate that acute aerobic exercise and fasting unaltered IMTG content both soleus and white gastrocnemius muscle. Skeletal muscle PLIN3, PLIN5, PPARβ/δexhibited a less response to experimental conditions. CS and β-HAD activity remained unaffected. CONCLUSIONS: These data indicate that exercise stimulus insufficient to improved lipid metabolic capacity. The metabolic health benefits of exercise training to be fully elucidated in older and clinical populations.
젖산염의 섭취가 육상 선수의 장시간 달리기 운동수행력에 미치는 영향
허성훈 ( Sung-hoon Hur ),안경준 ( Kyung-Jun An ),김윤미 ( Yoon-mi Kim ),권영우 ( Yeung-woo Kwon ),이종삼 ( Jong-Sam Lee ) 한국체육대학교 체육과학연구소 2021 스포츠사이언스 Vol.39 No.3
본 연구의 목적은 육상 선수를 대상으로 젖산염의 섭취에 따라 혈중 생리적 지표와 운동수행력에 미치는 효과를 규명하여 운동 선수들의 경기력 향상에 기초 자료를 제공함에 있다. 대구 소재 D대학교의 재학중인 중-장거리 육상 선수 총6(남 5, 여 1)명을 선정하였다. 실험 절차는 총 4회(음료를 섭취하지 않은 조건, No drink; 물을 섭취한 경우, Water; 이온 음료, Ion fluid; 젖산염이 함유된 음료, Polylactate)의 실험에 참가하였으며, 운동 강도 적용은 Karvonen et al.,(1957)의 예비심박수 산출 공식을 이용해 예비심박수의 65, 85, 90%에 해당되는 목표 심박수를 적용해 산출하였다. 음료의 섭취는 총 8회(운동 전 -30, -5분, 운동 중 15, 30, 45, 60, 75, 90분)에 걸쳐 이루어졌으며, 혈액 표본 채집 및 생리적 변인의 측정은 총 4회(-40, -5, 90분, All-out) 채집하여 분석한 결과, 첫째, 장시간 달리기 운동 중 음료 섭취에 따른 혈중 생리적 지표(glucose, lactate, pH, HCO<sub>3</sub><sup>-</sup>)의 유의한 변화를 나타내지 못했다. 둘째, 장시간 달리기 운동 중 음료 섭취에 따른 운동수행력(time to exhaustion)을 분석한 결과, 장시간 달리기 운동 중 음료 섭취 형태에 따른 운동수행력은 음료를 섭취하지 않은 조건(ND: 12.4±8.7분), 물을 섭취한 경우(Water: 21.8±1.1분), (PS: 28.2±12.5분), 젖산염이 함유된 음료(CM: 36.7±7.6분) 순으로 운동 수행 시간이 향상된 것으로 나타났으나 젖산염이 함유된 음료는 이온 음료와 비교해 유의한 기록의 향상은 나타나지 않았다. This study aims to to find out the effect of polylactate ingestion on physiological indices exercise performance in elite distance runners. Six (5 male and 1 female) elite distance runners (age: 21.3±0.7 years, height: 168.0±7.1 cm, body weight: 55.1±7.8 kg, VO<sub>2</sub>max: 66.6±3.3 mL·kg<sup>-1</sup>·min<sup>-1</sup>) volunteered for this study. In a single blind and random cross over design, subjects participated separated 4 trials; No Drink (ND), Water, PS (ion fluid), CM (polylactate). Blood sample were collected during the four phases of treadmill exercise; rest exercise (-40 min), before exercise (-5 min), after exercise (90 min) and all-out. Runners performed continuous exercise with ingestion of drink (ND, Water, PS, CM) at 65% of THR (target heart rate) for 90 minutes followed by 85% of THR with 5°for 20 minutes (if completed 85% running performance then applied 90% of THR with 5°) until volitional time to exhaustion (TTE). There were no differences between the conditions for any physiological indices. Running TTE increased for CM compared to between ND and Water trials (12.41±5.60 min and 21.82±0.69 min, respectively). However, time to exhaustion did not differ between both conditions (28.22±8.06 and 32.09±9.90 minutes for PS and CM). This study demonstrated that ingestion of polylactate does not sufficiently large to improve extracelluar buffering capacity and endurance exercise performance.