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PdCu를 전기 도금한 레이저 유도 그래핀 전극 기반의 과산화수소 측정 센서 개발
박대한(Daehan Park),한지훈(Ji-Hoon Han),김태헌(Taeheon Kim),박정호(Jungho Pak) 대한전기학회 2018 전기학회논문지 Vol.67 No.12
In this paper, we describe the fabrication and characterization of a hydrogen peroxide (H₂O₂) sensor based on palladium and copper (PdCu) electroplated laser induced graphene (LIG) electrodes. CO2 laser was used to form LIG electrodes on a PI film. This fabrication method allows simple control of the LIG electrode size and shape. The PdCu was electrochemically deposited on the LIG electrodes to improve the electrocatalytic reaction with H₂O₂. The electrochemical performance of this sensor was evaluated in terms of selectivity, sensitivity, and linearity. The physical characterization of this sensor was conducted using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), which confirmed that PdCu was formed on the laser induced graphene electrode. In order to increase the sensor sensitivity, the Pd:Cu ratio of the electroplated PdCu was varied to five different values and the condition of highest amperometric current at an identical of H₂O₂ concentration was chosen among them. The resulting amperometric current was highest when the ratio of Pd:Cu was 7:3 and this Pd;Cu ratio was employed in the sensor fabrication. The fabricated PdCu/LIG electrode based H₂O₂ sensor exhibited a sensitivity of 139.4 ㎂/mM·㎠, a broad linear range between 0 mM and 16 mM of H₂O₂ concentrations at applied potential of –0.15 V, and high reproducibility (RSD = 2.6%). The selectivity of the fabricated sensors was also evaluated by applying ascorbic acid, glucose, and lactose separately onto the sensor in order to see if the sensor ourput is affected by one of them and the sensor output was not affected. In conclusion, the proposed PdCu/LIG electrode based H₂O₂ sensor seems to be suitable H₂O₂ sensor in various applications.
단기간의 체중감량에 따른 고교 유도선수의 무드상태와 생리적 변화
박대한 ( Daehan Park ),손준호 ( Joonho Shon ),류호상 ( Hosang Yoo ) 한국스포츠심리학회 2017 한국스포츠심리학회지 Vol.28 No.4
목적: 이 연구의 목적은 단기간의 체중감량에 따른 고등학교 유도선수의 무드상태와 생리적 변화를 파악하는 것이었다. 방법: 연구 참여에 동의한 총 24명의 남자 유도선수들은 실험집단(12명) 또는 통제집단(12명)에 무선으로 배정되었다. 두 집단은 주 7회로 정해진 운동프로그램에 따라 하루 총 4회의 운동을 실시하였고, 실험집단은 운동과 함께 식이조절을 통하여 체중감량을 실시하였다. SPSS Ver 22.0K 통계프로그램을 이용한 자료처리는 두 집단을 대상으로 체중감량 프로그램 전과 후에 각각 무드상태와 생리적 변인들을 측정하여 각 항목의 사전검사 값을 공변인으로 하는 공분산분석(Analysis of Covariance)을 실시하였다. 그러나 분석 전에 회귀동등성(homogeneity of regression) 검증을 통해서 위배되는 경우에는 반복측정분산분석(repeated measures ANOVA)을 실시하였다. 결과: 무드상태에서 실험집단의 긴장, 우울, 피로, 혼란, 총정서장애는 통제집단보다 높았고, 활력에서는 유의하게 낮은 평균을 나타냈다. 생리적 변인들 중 혈당과 제지방에서 실험집단은 통제집단보다 유의하게 낮은 평균을 보여주었다. 결론: 단기간의 체중감량은 고등학교 유도선수의 무드상태와 생리적 변화에 부정적인 영향을 미친다는 결론에 도달하였다. Purpose: The purpose of this study aimed to investigate if mood states (tension, depression, anger, vigor, fatigue, confusion) and physiological states (blood pressure, heart rate, blood glucose, body fat, lean body mass) change after seven-day weight reduction. Method: A total of twenty four male judo players participated in this study and were randomly assigned to either experimental group or control group. The data obtained from each measure were analyzed using Analysis of Covariance, respectively. In case of violation through regression equality test before analysis, repeated measure ANOVA was performed. Results: Analysis of covariance using pre-test score as covariate showed that the tension, the depression, the fatigue, the confusion, and the total mood disturbance levels increased significantly after weight reduction while the vigor, the lean body mass, and glucose level decreased. No change was found in the blood pressure, the heart rate, and the percent body fat. Conclusion: It was concluded that short-term rapid weight reduction has negative impact on psychological and physiological states in high school Judo athletes.
Wearing Comfort Evaluation of Safety Shoes with a Ventilation System
Eunjin Jeon,Jihyun Ha,Heeeun Kim,Seikwon Park,Daehan Jung,Jangwoon Park,Seunghoon Lee,Seungbum Park,Heecheon You 대한인간공학회 2013 대한인간공학회 학술대회논문집 Vol.2013 No.10
Objective: The present study is intented to evaluate a safety-shoe with a ventilation hole in terms of inside-shoe microclimate and wearing comfort. Background: Safety shoes have functions to protect a worker’s feet and provide proper fitness and thermal comfort. However, the workers are wearing safety shoes for more than 6 hours a day, so that the safety shoes are exposed to the problems of skin disease such as athlete’s foot. Method: Ergonomic tests were conducted with safety-shoe wearers in industry to compare with ventilation hole shoes with the patented ventilation system to without ventilation shoes without a ventilation system in terms of skin temperature, microclimate(temperature, humidity), local sweat rate, thermography and subjective comfort. Results: The skin temperature measured at the navicular bone was found less increased in with ventilation hole shoes than in without ventilation shoes on average by 0.1℃ during the rest period and 0.5℃ during the exercise and recovery periods. The inside-shoe temperature measured at the toe region was found less increased in with ventilation hole shoes than in without ventilation shoes on average by 0.6℃ during the rest period and 0.3℃ during the exercise period. The inside-shoe humidity measured at the toe region was found less increased in with ventilation hole shoes than in without ventilation shoes on average by 15.1% during the rest period, 11.1% during the exercise period, and 15.2% during the recovery period. The amount of sweat measured on the foot at the end of the experiment was found significantly less in with ventilation hole shoes than in without ventilation shoes on average by 34%. Conclusion: The present study found that the safety shoes with ventilation system were superior than general safety shoes by decreasing skin temperature, inside shoe temperature, and relative humidity and by increasing thermal comfort. Application: The air ventilation system of the safety shoes can be applicable to military boots or golf shoes to increase their thermal comfort.