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가변저항과 열전대를 이용한 브레이크 패드 마모 및 디스크 온도 센서 개발
김만복(Man Bok Kim),유정주(Jung Joo Yoo),변경석(Kyung Seok Byun) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.11
The brake system is essential for safe vehicle operation. Any malfunction or failure of the brake system can lead to serious accidents such as injuries or death of occupants. If the brake system can be monitored in real time, the monitoring system can notify the driver of dangerous situations such as excessive wear of the brake pads or overheating of the brake disc. Fatal accidents can be prevented by reducing the risk of brake system malfunction or failure. In this research, a sensor capable of measuring brake pad wear and disk temperature in real time is proposed. The sensor consists of variable resistance and a thermocouple. Through the experiments on the developed sensor, it is confirmed that the brake pad wear error is less than 0.1 mm and the brake disk temperature error is less than 10℃.
구미지역 미용업 종사자들의 눈, 피부, 호흡기 증상 경험률
사공준(Joon Sakong),김만복(Man-Bok Kim) 한국인체미용예술학회 2013 한국인체미용예술학회지 Vol.14 No.3
This research investigated the prevalence of ocular, dermatologic, and respiratory symptoms caused by hairdressers' exposure to harmful chemical substance. It compared the degree of risk of experiencing symptoms between the hairdressers' group and the control group, and evaluated the relationship between hairdressers' types of work and work characteristics and the symptoms. Fifty-three beauty parlors located in Gyeongbuk Gumi city were extracted through convenience sampling. The subjects were then divided into the exposure group composed of 103 hairdressers, and the control group composed of 98 ordinary persons. This research showed that the ocular, dermatological, and respiratory system symptoms in the hairdressers' group were significantly higher than those in the control group. Moreover, the degree of risk in experiencing symptoms in the hairdressers' group was 2∼3 times higher in eye-related symptoms, 3 times higher in red spots in the skin-related symptoms, and 2∼3 times higher in respiratory system-related symptoms compared to those in the control group. To prevent occupational dyscrasia among hairdressers, it is necessary for them to wear personal protective equipments, wash hands after work, improve working environment, and develop mild beauty treatment products. Symptoms among workers should be early detected and management, such as task switching, should be taken.