• 대한통합의학회지
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• 제8권4호
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• pp.133-142
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• 2020

Purpose : The purpose of this study was to investigate the effective recovery method of exercise-induced fatigue and muscle pain by comparing the effect of the use of illite hot mat product and general hot mat product on the recovery of muscle pain induced by high intensity exercise. Methods : To measure and analyze the changes in lactic acid, CRP, and ACR according to the high-intensity circuit training program, this study was conducted for the healthy adult men and women, who exercise st the K-region sports center. A total of 45 subjects were studied in 15 groups of 15 patients who received an illite hot-water mat recovery group (A group), 15 general hot-water mat recovery group (B group), and 15 control group (C group). The circuit training exercise program was conducted as a one-time exercise, and each exercise time consisted of 30 minutes of warm-up exercise, 5 minutes of main exercise, 20 minutes of clean-up exercise, and 5 minutes of strength exercise. The intensity setting was high intensity of subjective exercise intensity It carried out by setting to (14-16RPE). Results : Changes in Lactic Acid Concentration There was a significant difference in the lactic acid concentrations between the groups after the high intensity circuit training program (p <.05). The illite rest group (A) decreased 7.71 mmol / L and the control group decreased 4.03 mmol / L. Significantly decreased (p <.05). Changes in ACR Concentration. There was a significant difference in the ACR concentrations Significant differences were found in CRP and ACR during the recovery period after exercise. (p <.05), the elite rest group (A) decreased 2.47 mg / mmol, and the control group increased 1.63 mg / mmol. There was a significant difference (p <.05). Conclusion: The static rest on a heated mat after high-intensity exercise has an effect on changes in blood lactate and ACR levels.

• 생명과학회지
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• 제13권4호
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• pp.448-456
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• 2003

유산소운동과 서어킷 웨이트 트레이닝이 호흡순환기능과 신체조성에 미치는 영향을 알아보기 위하여 P시에 거주하는 직장여성 16명을 대상으로, 8명을 운동군으로 나머지 8명을 통제군으로 하여 운동군에게는 1일 1시간씩, 주당 5일, 8주간의 유산소운동(70%∼80%HRmax)과 서어킷 웨이트 트레이닝(1RM의 40%∼50%)을 실시하였다. 두 군 모두 pretest와 posttest를 실시하여 호흡순환기능과 신체구성의 변화를 비교ㆍ분석한 결과, 운동군에서는 안정시의 심박수는 유의하게 감소하였고(p<.001), 산소섭취량, 환기량 그리고 폐활량은 유의하게 증가하였다(p<.001). 최대운동시 산소섭취량도 운동군에서는 유의한 증가가 나타났다(p<.001). 또한 운동군에서는 체지방률과 체지방량은 유의하게 감소한(p<.001) 반면 제지방률과 제지방량은 유의하게 증가하였다(p<.001). 이상의 결과에서 유산소운동과 저항성운동의 복합 프로그램은 직장여성의 심폐기능 향상과 체지방 감소에 긍정적인 영향을 미치는 것으로 나타났다.

• 전력전자학회논문지
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• 제20권5호
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• pp.389-394
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• 2015

This paper proposes a series-connected power conversion system that integrates a photovoltaic power conditioner and a charge-balancing circuit. In conventional methods, a photovoltaic power conditioner and a cell-balancing circuit are needed for photovoltaic systems with energy storage devices, which results in a complex configuration and high cost. To overcome these problems, a series-connected DC-DC power conditioning system that integrates a photovoltaic power conditioner with a charge-balancing circuit is proposed. During the generation, the system operates as power conditioner only, whereas it operates as a cell balancing circuit during the rest time. For the analysis, the operating principle of the circuit and the controller design are done by PSIM simulation. For verification, a hardware prototype with 48-W photovoltaic modules has been implemented. Results verified that the modularized photovoltaic power conversion system with a series-connected storage successfully works with the proposed method.

• 한방비만학회지
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• 제4권1호
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• pp.95-123
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• 2004

Objects: This study was aimed to find out correlation between life style and cardiopulmonary function and body fat. Methods: We divided two groups by the score of behavior modification therapy questionnaire. Westudied tendency of change of cardiopulmonary function and body fat for medication of Mahuang capsule by ergogenic aids and placebo with circuit training. We got the results for Exercise stress test and Segmental Bioelectrical Impedence Analysis. Results: 1. High Score Group in Behavior Modification Therapy Questionnaire significantly(p<.05) showed elevation of Lean Body Mass, Body Fat, Waist Circumference and not significantly elevation of Body Weight, But Basal Metabolic Rate was declined. Low Score Group in Behavior Modification Therapy Questionnaire significantly(p<.05) showed elevation of Waist Circumference and not significantly elevation of Body Weight and Body Fat, Lean Body Mass but decline of Basal Metabolic Rate, Waist to Hip Ratio 2. High Score Group in Behavior Modification Therapy Questionnaire significantly(p<.05) showed elevation of $VO_{2max}$ and not significantly elevation of the rest. Low Score Group in Behavior Modification Therapy Questionnaire significantly(p<.05) showed elevation of rest Heart Rate, Diastolic Blood Pressure, and not significantly elevation of the rest except for METs Conclusion: High score group in Behavior Modification Therapy Questionnaire showed significantly elevation of body composition, but had no relationship with Cardiopulmonary function

• JSTS:Journal of Semiconductor Technology and Science
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• 제14권6호
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• pp.706-711
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• 2014

A low power 6-bit flash ADC that uses an input voltage range detection algorithm is described. An input voltage level detector circuit has been designed to overcome the disadvantages of the flash ADC which consume most of the dynamic power dissipation due to comparators array. In this work, four digital input voltage range detectors are employed and each input voltage range detector generates the specific clock signal only if the input voltage falls between two adjacent reference voltages applied to the detector. The specific clock signal generated by the detector is applied to turn the corresponding latched comparators on and the rest of the comparators off. This ADC consumes 68.82 mW with a single power supply of 1.2V and achieves 4.3 effective number of bits for input frequency up to 1 MHz at 500 MS/s. Therefore it results in 4.6 pJ/step of Figure of Merit (FoM). The chip is fabricated in 0.13-um CMOS process.

• 대한전기학회논문지
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• 제36권2호
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• pp.140-147
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• 1987

In this paper, seven-order elliptic low-pass passive network is synthesized by using doublyterminated ladder network is directly transformed into the active network which has the advantage of low sensitivity and can be realized conveniently. The circuit simulation results of passive network and active network synthesized with FDNR and Leap-frog technique are compared, and it is proved that the two rest work has the same characteristics.

• 한국산학기술학회논문지
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• 제13권4호
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• pp.1777-1783
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• 2012

본 논문에서는 DC모터의 출력특성을 개선할 수 있는 새로운 구조의 DC모터 구동회로를 설계하였고 이 회로를 이용한 콘트롤러를 개발하였다. 설계된 구동 회로에 의하여 콘트롤러는 자체발진회로의 스위칭 신호를 갖는 트랜스포머를 이용하여 연속적으로 DC모터를 구동할 수 있다. 또한 최대속도시, 제어회로의 기준전압 값을 삼각파보다 높게 유지할 수 있고 모터 구동 FET를 항상 온 값을 가지도록 하여 최대출력을 얻을 수 있도록 한다. 제안된 구동회로를 활용하여 24V-500W급 DC모터속도 컨트롤러를 개발하였고 소형전동차를 제작하고 구동시험을 실시하였다. 구동테스트 및 특성 측정결과, 구동전류 12A로써 DC모터의 전진 및 후진 속도를 연속 가변 할 수 있음을 보였다. 그 밖에 과전류 감시기능, 모터과열 감시기능의 정상동작을 확인하였으며, 배터리 잔량이 20~100%까지 6단계로 표시할 수 있음을 확인하였다.

• 전자공학회논문지SC
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• 제38권3호
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• pp.31-39
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• 2001

본 논문에서는 CMOS 이미지 센서의 동작 범위(Dynamic Range; DR)를 높이기 위해서， multiple sampling 방법과 조건적 reset 기능을 갖는 새로운 픽셀 회로를 제안한다. 제안된 구조는 한 번의 integration 시간 내에서 픽셀의 출력이 일정한 간격으로 여러 번 sampling되고 sampling된 각 신호는 기준 전압과 비교되며 이 결과에 따라 해당 픽셀을 rest 할지의 여부가 결정된다. 제안된 방법을 사용하면 이미지 센서의 최대 DR은 축적 기간 동안의 총 sampling 회수인 N 배로 증가될 수 있다. 테스트 칩은 0.65-${\mu}m$ CMOS 공정(2-P, 2-M)으로 제작되었으며 이에 대한 측정결과로 본 논문의 알고리듬이 DR의 증가에 효과적임을 확인하였다.

• Journal of Electrical Engineering and Technology
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• 제13권5호
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• pp.2134-2143
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• 2018

This work introduces a fault diagnosis method for transformer based on self-powered radio frequency identification (RFID) sensor tag and improved Hilbert-Huang transform (HHT). Consisted by RFID tag chip, power management circuit, MCU and accelerometer, the developed RFID sensor tag is used to acquire and wirelessly transmit the vibration signal. A customized power management including solar panel, low dropout (LDO) voltage regulator, supercapacitor and corresponding charging circuit is presented to guarantee constant DC power for the sensor tag. An improved band restricted empirical mode decomposition (BREMD) which is optimized by quantum-behaved particle swarm optimization (QPSO) algorithm is proposed to deal with the raw vibration signal. Compared with traditional methods, this improved BREMD method shows great superiority in reducing mode aliasing. Then, a promising fault diagnosis approach on the basis of Hilbert marginal spectrum variations is brought up. The measured results show that the presented power management circuit can generate 2.5V DC voltage for the rest of the sensor tag. The developed sensor tag can achieve a reliable communication distance of 17.8m in the test environment. Furthermore, the measurement results indicate the promising performance of fault diagnosis for transformer.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 추계종합학술대회
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• pp.685-688
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• 2005

플라즈마 디스플레이를 위한 효율적인 서스테인 드라이버와 이를 리셋 회로와 결합시키는 유용한 결합 방법을 제시한다. 제안된 서스테인 드라이버는 외부 인덕터와 패널에 존재하는 기생 커페시터 간의 직렬공진 방식을 이용한다. 이 회로는 4개의 스위칭 소자, 인덕터, 전원공급을 목적으로 하는 외부 커패시터로 구성된다. 기존의 방식과 비교하여 입력전원전압이 두배가 되지만 스위칭 소자에 가해지는 전압스트레스는 기존의 값과 거의 동일하며, 입력 전압을 별도의 승압없이 리셋 회로의 전원으로 사용할 수 있는 장점을 가진다. 이러한 회로적 구조는 서스테인 드라이버와 리셋회로를 간단히 구성할 수 있다. 이론적 분석을 바탕으로 동작원리와 설계 예를 제시하며, 7.5인치 AC PDP 패널을 이용한 실험을 통해 타당성을 검증한다.