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Isamu Nishida,Masato Maeda,Tsuneo Kawano,Keiichi Shirase (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Factory automation and efficiency-oriented unmanned factories have become the major trend in manufacturing systems in recent years. However, human-centered manufacturing is gaining attention because of the flexibility it offers to manufacturing systems in terms of both product variety and volume. Although some digital human models capable of estimating the power generated by human muscles during various manufacturing-related tasks have been developed, a more effective method of analyzing muscle power is required to better estimate human muscle power. In the present study, a new musculoskeletal model taking the function of bi-articular muscles into consideration is applied to estimate the power generated by human muscles. The purpose of this study is to optimize working conditions that satisfy both the height of subjects and their maximum muscle power during a lifting operation. Results indicate the model is able to predict the heaviest weight and maximum height that this weight can be lifted to keep muscle power of the upper limb of a subject under 70% of the maximum muscle power. Moreover, the analyzed muscle power of the upper limb from experimental lifting operations is in good agreement optimized environments where humans can work efficiently and safely considering their physical characteristics.
Kunihiro Oyama,Masato Kanzaki,Mitsuko Kondo,Hideyuki Maeda,Kei Sakamoto,Tamami Isaka,Jun Tamaoki,Takamasa Onuki 대한흉부외과학회 2017 Journal of Chest Surgery (J Chest Surg) Vol.50 No.3
Background: To improve postoperative outcomes associated with interstitial pneumonia (IP) in patients with lung c ancer, t he m anagement of t he p ostoperative a cute e xacerbation of I P (PAEIP) was investigated. Methods: Patients with primary lung cancer were considered to be at risk for PAEIP (possible PAEIP) based on a preoperative evaluation. The early phase of this study was from January 2001 to December 2008, and the late phase was from January 2009 to December 2014. In the early phase, chest computed tomography (CT) was performed for patients for whom PAEIP was suspected based on their symptoms, whereas in the late p hase, chest CT w as r outinely p erformed w ithin a few days p ostoperatively. The n umbers o f possible PAEIP cases, actual PAEIP cases, and deaths within 90 days due to PAEIP were compared between both phases. Results: In the early and late phases, surgery was performed in 712 and 617 patients, 31 and 72 possible PAEIP cases were observed, nine and 12 actual PAEIP cases occurred, and the mean interval from the detection of PAEIP to starting treatment was 7.3±2.3 and 5.0±1.8 days, respectively. Five patients died in the early phase, and one patient died in the late phase. Significantly fewer PAEIP-related deaths were observed in the late phase (p<0.05). Conclusion: Identifying patients at risk for PAEIP by routine postoperative CT examinations led to the early diagnosis and treatment of PAEIP, resulting in the reduction of PAEIP-related mortality.
Yoshikazu Yamasaki,Masato Goto,Akira Kariyasaki,Yoshiko Yamaguchi,Masaya Miyazaki,Hideaki Maeda,Shigeharu Morooka 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6
When two immiscible liquids make contact in a microchannel, the flow pattern is affected by the affinity between channel walls and liquids. In this study, microchannels (200 μm in width and 200 μm in depth) having a Tshaped bifurcation point were fabricated on PMMA plates. The inner walls of the microchannels were modified in a zone-selective manner to be either hydrophilic or hydrophobic, based on verification accomplished via a laser interference fringe technique. The microchannel was placed horizontally, and water and octane were introduced into the upper-side channel (hydrophilic) and into the lower-side channel (hydrophobic), respectively. The experimental results showed that water and octane formed a stable layered flow, and the two liquids were virtually completely separated at the T-shaped section, even when static pressure was intentionally applied to the outlets. CFD simulation, using FLUENT 6.3 software, was performed to explain the role of zone-selective modification of microchannel walls.