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Mental workload during VDT work with time pressure
Hiroyuki Izumi,Masanori Ohta,Masaharu Kumashiro 대한인간공학회 2007 대한인간공학회 학술대회논문집 Vol.- No.-
The aim of this study is to evaluate the time pressure effects induced by maximum time constraints on worker’s workload and performance. Time pressure is induced by time constraints. Almost workers should be performed their work under time pressure condition. So, time pressure is one of most important stressors in the workplace. In many case, time pressure was defined as the difference between the amount of available time and that of time required to solve a task. The time measured under free pace with task teaching only seems that it dose not equal to the ability of worker. The time measured under the condition of making the worker hurry by compulsion is needed to evaluate the effects of time pressure on worker’s workload and performance. In this study, the subjects required to finish each task within a shortest available time that varied depending on the task performance one task before.
( Yuki Wada ),( Hideyuki Tamai ),( Akira Kawashima ),( Naoki Shingaki ),( Yoshiyuki Mori ),( Masanori Kawaguchi ),( Kosaku Moribata ),( Hisanobu Deguchi ),( Kazuki Ueda ),( Izumi Inoue ),( Takao Maeki 대한소화기학회 2014 Gut and Liver Vol.8 No.4
Background/Aims: The present study aimed to clarify whether virological response within 2 weeks after therapy initiation can predict a null response to pegylated interferon α-2b plus ribavirin therapy in patients with high viral load genotype 1b hepatitis C. Methods: The participants consisted of 72 patients with high viral load genotype 1b. The dynamics of viral load within 2 weeks were measured. Results: Significant differences between null responders and nonnull responders were noted for interleukin (IL)-28B genotype, amino acid 70 substitution, α-fetoprotein, low-density lipoprotein cholesterol, hyaluronic acid, and viral response. The area under the curve (AUC) for the receiver operating characteristic curve of the hepatitis C virus (HCV) RNA level decline at 2 weeks (AUC=0.993) was the highest among the factors predicting the null response. When the cutoff value for the HCV RNA level decline at 2 weeks was set at 0.80 log, the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy in predicting a null response were 82%, 96%, 82%, 96%, and 94%, respectively. In comparison, values for the non-TT and mutant type of amino acid 70 substitution were similar to those for HCV RNA level decline at 2 weeks. Conclusions: Virological response at 2 weeks or the combination of IL-28B and amino acid 70 substitution are accurate predictors of a null response. (Gut Liver 2014;8:421-427)
WEIDA YAN,SHUHEI AOYAMA,HIROTAKE ISHII,HIROSHI SHIMODA,TRAN T. SANG,SOLHAUGLARS INGE,TOPPE ALEKSANDER LYGREN,JOHNSEN TERJE,MASANORI IZUMI 한국원자력학회 2012 Nuclear Engineering and Technology Vol.44 No.5
When decommissioning a nuclear power plant, it is difficult to make an appropriate plan to ensure sufficient space for temporary placement and conveyance operations of dismantling targets. This paper describes a system to support temporary placement and conveyance operations using augmented reality (AR). The system employs a laser range scanner to measure the three-dimensional (3D) information of the environment and a dismantling target to produce 3D surface polygon models. Then,the operator simulates temporary placement and conveyance operations using the system by manipulating the obtained 3D model of the dismantling target in the work field. Referring to the obtained 3D model of the environment, a possible collision between the dismantling target and the environment is detectable. Using AR, the collision position is presented intuitively. After field workers evaluated this system, the authors concluded that the system is feasible and acceptable to verify whether spaces for passage and temporary storage are sufficient for temporary placement and conveyance operations. For practical use in the future, some new functions must be added to improve the system. For example, it must be possible for multiple workers to use the system simultaneously by sharing the view of dismantling work.
Yan, Weida,Aoyama, Shuhei,Ishii, Hirotake,Shimoda, Hiroshi,Sang, Tran T.,Inge, Solhaug Lars,Lygren, Toppe Aleksander,Terje, Johnsen,Izumi, Masanori Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.5
When decommissioning a nuclear power plant, it is difficult to make an appropriate plan to ensure sufficient space for temporary placement and conveyance operations of dismantling targets. This paper describes a system to support temporary placement and conveyance operations using augmented reality (AR). The system employs a laser range scanner to measure the three-dimensional (3D) information of the environment and a dismantling target to produce 3D surface polygon models. Then, the operator simulates temporary placement and conveyance operations using the system by manipulating the obtained 3D model of the dismantling target in the work field. Referring to the obtained 3D model of the environment, a possible collision between the dismantling target and the environment is detectable. Using AR, the collision position is presented intuitively. After field workers evaluated this system, the authors concluded that the system is feasible and acceptable to verify whether spaces for passage and temporary storage are sufficient for temporary placement and conveyance operations. For practical use in the future, some new functions must be added to improve the system. For example, it must be possible for multiple workers to use the system simultaneously by sharing the view of dismantling work.