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A Smart Bench Press Machine: Automatic Weight Control Sensitive to User Tiredness
김지훈,조한진,김기영,지해근,김재효 국제문화기술진흥원 2019 International Journal of Advanced Culture Technolo Vol.7 No.1
In order to provide a safe free-weight-training environment to people without workout trainers, we suggesta smart bench press machine with an automatic weight control system sensitive to user tiredness. Physicalweight plates on the machine are replaced with a hydraulic cylinder as a press load and the cylinder knob iscoupled with a step motor to change its tensile force automatically in-between lifting exercises. Three subjectsparticipated to verify the usability of the smart bench press machine. They were asked to lift a 6-RM press load10 times with 3 different lifting conditions: 1) no assistance, 2) a human assistance, and 3) the automaticweight control. All subjects were not able to complete the 10 sets without assistance due to tiredness, but theyfinished the full sets under the two assistive conditions. Average lifting speeds under the automatic weightcontrol condition showed the most consistent level. Normalized quasi-tension data based on surfaceelectromyogram signals of both Pectoralis Majors revealed that the subjects maintained the target muscleactivation level above 50% but not more than 80% throughout the 10 sets. Therefore, the smart bench pressmachine is expected to both keep pace with the lifting exercise and reduce risk of injuries due to excessivemuscle tensions.
남해안에서 자생하는 거머리말 ( Zostera Marina L. ) 식물의 분포와 생육지 환경
이상용(Sang Yong Lee),이성미(Sung Mi Lee),최청일(Chung Il Choi),지해근(Hae Geun Jee) 한국환경생물학회 2001 환경생물 : 환경생물학회지 Vol.19 No.4
N/A An ecological study was conducted to determine the geographic distribution, community structure, and habitat characteristics of eelgrass, Zostera marina L. beds along the southern coast of Korea. Plants and sediment samples were collected during June 2000 and December 2000 on twenty-eight locations, including two Cheju Island stations, which were used to compare morphological characteristics with habitat types. Z. marina populations existed from the intertidal to subtidal zone, mainly in the bays along the coast and the island, the barrier reef, and the estuary where the water depth was 0.5∼8.0m. Salinity range in Z. marina beds ranged 18.2 to 34.5‰. Sediments of Z. marina beds contained 49.7∼99.1% of sand and were classified into sand, muddy sand, and sandy mud. Mean grain size varied from 1.5 to 4.4 phi. Height of vegetation shoots varied from 54.7 to 171.4㎝, depending on water depth, location, substrata and habitat types. Quantitative morphological features that enabled recognition of the two phenetic groups were short-narrow leaf type and long-broad leaf type. Statistical analysis indicated that biomass of individual plants and their quantitative morphological characteristics were significantly correlated.