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A 4-Year Follow-up Cohort Study of the Respiratory Functions in Toner-handling Workers
Yanagi, Nobuaki,Kitamura, Hiroko,Mizuno, Mitsuhito,Hata, Koichi,Uchiyama, Tetsuro,Kuga, Hiroaki,Matsushita, Tetsuhiro,Kurosaki, Shizuka,Uehara, Masamichi,Ogami, Akira,Higashi, Toshiaki Occupational Safety and Health Research Institute 2014 Safety and health at work Vol.5 No.4
Background: Focusing on the respiratory function for health effect indices, we conducted a cross-sectional study on workers who did and did not handle toner to compare the longitudinal changes. Methods: Among 116 individuals who worked for a Japanese business equipment manufacturer and participated in the study, the analysis included 69 male workers who we were able to follow up for 4 years. We categorized the 40 workers engaged in toner-handling work as the exposed group and the 29 workers not engaged in these tasks as the referent group, and compared their respiratory function test results: peak expiratory flow rate (PEFR), vital capacity (VC), predicted vital capacity (%VC), forced expiratory volume in 1 second ($FEV_1$), and forced expiratory volume in 1 second as a percent of forced vital capacity ($FEV_1%$). Results: The cross-sectional study of the respiratory function test results at the baseline and at the $5^{th}$ year showed no statistically significant differences in PEFR, VC, %VC, $FEV_1$, and $FEV_1%$ between the exposed and referent workers. Also, respiratory function time-course for 4 years was calculated and compared between the groups. No statistically significant differences were shown. Conclusion: Our study does not suggest any toner exposure effects on respiratory function. However, the number of subjects was small in our study; studies of larger populations will be desired in the future.
A 4-Year Follow-up Cohort Study of the Respiratory Functions in Toner-handling Workers
Nobuaki Yanagi,Hiroko Kitamura,Mitsuhito Mizuno,Koichi Hata,Tetsuro Uchiyama,Hiroaki Kuga,Tetsuhiro Matsushita,Shizuka Kurosaki,Masamichi Uehara,,Akira Ogami,Toshiaki Higashi 한국산업안전보건공단 산업안전보건연구원 2014 Safety and health at work Vol.5 No.4
Background: Focusing on the respiratory function for health effect indices, we conducted a crosssectionalstudy on workers who did and did not handle toner to compare the longitudinal changes. Methods: Among 116 individuals who worked for a Japanese business equipment manufacturer andparticipated in the study, the analysis included 69 male workers who we were able to follow up for 4years. We categorized the 40 workers engaged in toner-handling work as the exposed group and the 29workers not engaged in these tasks as the referent group, and compared their respiratory function testresults: peak expiratory flow rate (PEFR), vital capacity (VC), predicted vital capacity (%VC), forcedexpiratory volume in 1 second (FEV1), and forced expiratory volume in 1 second as a percent of forcedvital capacity (FEV1%). Results: The cross-sectional study of the respiratory function test results at the baseline and at the 5thyear showed no statistically significant differences in PEFR, VC, %VC, FEV1, and FEV1% between theexposed and referent workers. Also, respiratory function time-course for 4 years was calculated andcompared between the groups. No statistically significant differences were shown. Conclusion: Our study does not suggest any toner exposure effects on respiratory function. However, thenumber of subjects was small in our study; studies of larger populations will be desired in the future
Force Control Strategy for Massage Chair Based on Masseur’s Knowhow Data Base
Tatsuya Teramae,Daisuke Kushida,Fumiaki Takemori,Akira Kitamura 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Recently, the massage chair is used by a lot of people because they were able to use it easily at home. However, a present massage chair only realizes the massage motion, and the physical condition of the user and the massage force is not considered. Then, the professional masseur’s massage process is that the physical condition of the patient is estimated, and the appropriate massage force is decided based on the estimated physical condition, and the decided massage force is realized. This paper proposes the method of applying masseur’s procedure for the massage chair. The realizability of the proposed method is verified by the experimental work using the massage chair.
Nonlinear Receding Horizon Control of a Tandem Cold Millin Acceleration and Deceleration Conditions
Kohei Ozaki,Toshiyuki Ohtsuka,Kenji Fujimoto,Akira Kitamura,Makishi Nakayama 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
For precise control of tension and thickness in a tandem cold millinac celeration and deceleration conditions, we employ an onlin ear model in cluding the rolling speed as a time-varying parameter. It is demon strated in simulation results that nonlinear receding horizon control by realtime optimization achieves satisfactory performance for the nonlinear model.