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The Effects Sodium Bicarbonate Intake on Blood Variables During High Intensity Exercise of Sprinter
김인동,김재중,박정범,Kim, In-Dong,Kim, Jae-Joong,Park, Jeong-Beom DAEHAN Society of Industrial Management 2021 산업융합연구 Vol.19 No.4
The purpose of this study was to investigate the effect of bicarbonate intake on blood variables during high-intensity training of sprinters. 30 male/female elites with more than 3 years of experience that are registered to S city as a sprinter was categorized into three groups: control group, training group, and HCO<sub>3</sub><sup>-</sup> and training group. Training group and HCO<sub>3</sub><sup>-</sup> and training group went through a high-intensity exercise program (80-90% HR max) which escalated every 2-3 weeks, for 90 minutes at a time, 5 days a week, 8 weeks in total. HCO<sub>3</sub><sup>-</sup> and Training group took in 300mg of bicarbonate per one kilogram of body weight, in 90 minutes before the start of the high-intensity exercise program, once a day for 8 weeks. As a result of the study, the effect of bicarbonate intake on blood variables during high-intensity training of sprinters showed a positive effect on the increase of pH and the decrease of lactic acid in HCO<sub>3</sub><sup>-</sup> and training group. Also, the increase of Ca<sup>2+</sup>, Na<sup>+</sup>, K<sup>+</sup> was shown in training group and HCO<sub>3</sub><sup>-</sup> and training group, whereas there were no indications of significant change in Mg<sup>2+</sup> in all three groups. It can be confirmed that the intake of bicarbonate during high-intensity training shows effective changes in the increase of pH and the decrease in lactic acid among changes in blood variables. Therefore, it can be seen that the intake of bicarbonate during high-intensity exercise is effective in improving exercise capacity. 본 연구는 단거리 달리기선수의 고강도 훈련 시 중탄산염 섭취가 혈액변인에 미치는 영향 규명하는데 연구의 목적이 있다. S시 남·여 단거리달리기 선수로 등록된 운동경력 3년 이상의 엘리트 선수 30명을 대상으로 통제집단, 훈련집단, 중탄산염 투여와 훈련집단의 세 집단으로 설정 후, 고강도 운동프로그램은 통제집단과 중탄산염 투여와 훈련집단을 대상으로 80-90%HRmax 운동강도를 2-3주마다 증가시키며, 총 8주간, 주 5일, 1회 90분 실시하였다. 중탄산염 섭취는 중탄산염 투여와 훈련집단을 대상으로 체중 1kg당 300mg을 고강도 운동프로그램 시작 90분 전 1일 1회 8주간 섭취하였다. 연구결과, 단거리달리기 선수의 고강도 훈련 시 중탄산염의 섭취가 혈액변인에 미치는 효과는 중탄산염 투여와 훈련집단에서 수소이온농도의 상승과 젖산의 감소에 긍정적인 효과가 나타났으며, Ca<sup>2+</sup>, Na<sup>+</sup>, K<sup>+</sup>은 훈련집단과 중탄산염 투여와 훈련집단에서 유의한 증가가 나타났다. Mg<sup>2+</sup>은 세 집단 모두에서 유의한 변화를 나타내지 않았다. 고강도 훈련 시 중탄산염의 섭취가 혈액변인의 변화 중 수소이온농도의 증가와 젖산의 감소에 효과적인 변화가 나타나는 것을 확인 할 수 있다. 따라서 고강도 운동 시 중탄산염의 섭취가 운동능력의 개선에 효과적임을 알 수 있다.
소나 시스템 설계를 위한 FFR 트랜스듀서 어레이의 등가회로 모델링
김인동(In-Dong Kim),최승수(Seung-Soo Choi),이학수(Haksue Lee),이승우(Seung Woo Lee),문원규(Wonkyu Moon) 대한전기학회 2017 전기학회논문지 Vol.66 No.4
Free-Flooded Ring (FFR) transducer array for use in Sonar system can be driven with large amplitude in a wide frequency band due to its structural characteristics, in which two resonances of a ring mode (1st radial mode) and an inner cavity vibration mode occur in a low frequency band. Since its sound wave generation characteristics are not influenced by the water pressure, the FFR transducer array is widely used in the deep sea. So FFR has been recognized as a low-frequency active sound source and has received much attention ever since. In order to utilize the FFR transducer array for SONAR systems in military and industrial applications, its equivalent electric circuit model is necessary especially to design the matching circuit between the driving power amplifier and the FFR transducer array. Thus this paper proposes the equivalent electric circuit model of FFR transducer array by using measured values of parameter, and suggest the improved method of parameter identification. Finally it verifies the effectiveness of the proposed circuit model of FFR transducer array by experimental measurements.
김만고(Marn-Go Kim),김진환(Jin-Hwan Kim),전성즙(Seong-Jeon),노의철(Eui-Cheol Nho),김인동(In-Dong Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
IGBT 소자는 고전류 밀도의 특성을 지니면서 구동전력이 작기 때문에 500V 이상의 고전압 응용에서 널리 이용되고 있다. 본 논문에서는 기존의 IGBT 소자의 구동회로가 갖는 기본기능 이외에 고자에 대한 보호기능과 소자의 동작 상태를 감지하기 위한 모니터링 기능을 갖는 지능형 구동회로에 대해 제안한다. 제안된 회로는 소자에 비종상적인 큰 전류가 흐를 경우 논리 회로에 의해 게이트 구동전압을 일정시간 즉시 차단하여 소자를 과전류와 과열로부터 보호하고, 소자의 동작 상태가 정상인지 차단 상태인지 감지할 수 있다. 언급한 기능을 가진 구동회로가 제시되며, 제안된 회로의 동작은 Pspice를 이용한 시뮬레이션 및 실험을 통해 확인된다.
자동차용 고장력 강의 진동특성에 미치는 미세조직의 영향
이충도(Choong Do Lee),한훈석(Hun Seok Han),김인동(In Dong Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
In present study, it aims to investigate the vibration characteristics of high strength steel for automobile structural applications, under resonance frequency. The specific damping capacity(SDC) was obtained from logarithmic decayed curve expressed as an index of damping property and the 1st resonance frequency was measure from free-free mode. The elastic modulus could obtain indirectly from measurement of resonance frequency and there is a linear relationship between 1st resonance frequency and elastic modulus. The SDC of steel that has a mixed microstructure of ferrite and bainite is higher than that of ferrite+martensite and ferrite+pearlite structure.
새로운 양방향 ZVS PWM Sepic/Zeta DC-DC 컨버터
金仁東(In-Dong Kim),彭盛煥(Seong-Hwan Paeng),朴成大(Sung-Dae Park),魯義哲(Eui-Cheol Nho),安珍雨(Jin-Woo Ahn) 대한전기학회 2007 전기학회논문지 Vol.56 No.2
Bidirectional DC-DC converters allow transfer of power between two de sources, in either direction. Due to their ability to reverse the direction of flow of power, they are being increasingly used in many applications such as battery charger/dischargers, de uninterruptible power supplies, electrical vehicle motor drives, aerospace power systems, telecom power supplies, etc. This paper proposes a new bidirectional Sepic/Zeta converter. It has low switching loss and low conduction loss due to auxiliary communicated circuit and synchronous rectifier operation, respectively. Because of positive and buck/boost-like DC voltage transfer function(M=D/1-D), the proposed converter is very desirable for use in distributed power system. The proposed converter also has both transformer-less version and transformer one.