Pub Date : 2020-12-31DOI: 10.5136/LIFESUPPORT.32.118
Seong-Bug Park, M. Mizuno, Kosuke Fujii, H. Kadokura, Tomonori Sano, Toshinari Tanaka, A. Sekizawa
{"title":"Improvement of Phased Evacuation Scenario based on Analyses of Pedestrian Flow in Stairwell during Drills in High-rise Office Building","authors":"Seong-Bug Park, M. Mizuno, Kosuke Fujii, H. Kadokura, Tomonori Sano, Toshinari Tanaka, A. Sekizawa","doi":"10.5136/LIFESUPPORT.32.118","DOIUrl":"https://doi.org/10.5136/LIFESUPPORT.32.118","url":null,"abstract":"","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123575880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.5136/LIFESUPPORT.32.83
Natsuki Uchida, A. Katoh, Hiroki Kamijo, Kazunori Yamazaki, H. Sumikura, T. Arafune, A. Homma, T. Yaguchi
The autonomic nervous system controls the size of the pupil diameter. In particular, the pupil diameter fluctuation, which constantly change the size of the pupil under constant illuminance, is correlated with the heart rate fluctuation commonly used in autonomic function estimation. Autonomic function estimation by pupil diameter fluctuation is still under development because albino rats often used in autonomic nervous function experiments. In this study, we propose a method to detect a pupil and measure pupil diameter by image processing of albino rats under near-infrared illumination without fixing eyelids. As a result of pupillary diameter measurement accuracy evaluation, the mean error rate of the measured value and the calculated value was 0.51%, and the correlation coefficient was 0.955 (p < 0.001), suggesting the usefulness of the proposed method. In addition, we obtained the pupil diameter fluctuation under restraint load using the proposed method, and examined whether autonomic nerve function can be estimated by frequency analysis. The analysis confirmed the tendency of autonomic nervous system function observed during restraint load, suggesting that autonomic nervous function estimation by pupil diameter fluctuation may be possible.
{"title":"Proposal of Pupil Diameter Measurement Method and Restraint Stress in Albino Rats for Estimate of Autonomic Nervous System","authors":"Natsuki Uchida, A. Katoh, Hiroki Kamijo, Kazunori Yamazaki, H. Sumikura, T. Arafune, A. Homma, T. Yaguchi","doi":"10.5136/LIFESUPPORT.32.83","DOIUrl":"https://doi.org/10.5136/LIFESUPPORT.32.83","url":null,"abstract":"The autonomic nervous system controls the size of the pupil diameter. In particular, the pupil diameter fluctuation, which constantly change the size of the pupil under constant illuminance, is correlated with the heart rate fluctuation commonly used in autonomic function estimation. Autonomic function estimation by pupil diameter fluctuation is still under development because albino rats often used in autonomic nervous function experiments. In this study, we propose a method to detect a pupil and measure pupil diameter by image processing of albino rats under near-infrared illumination without fixing eyelids. As a result of pupillary diameter measurement accuracy evaluation, the mean error rate of the measured value and the calculated value was 0.51%, and the correlation coefficient was 0.955 (p < 0.001), suggesting the usefulness of the proposed method. In addition, we obtained the pupil diameter fluctuation under restraint load using the proposed method, and examined whether autonomic nerve function can be estimated by frequency analysis. The analysis confirmed the tendency of autonomic nervous system function observed during restraint load, suggesting that autonomic nervous function estimation by pupil diameter fluctuation may be possible.","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122594944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.5136/LIFESUPPORT.32.90
Toshinari Tanaka, Seong-Jeong Park, M. Mizuno
The purpose of this study is to investigate characteristics of exit choice during evacuation in underground mall fire using virtual reality (VR) escape simulator in cooperation with thirty subjects. Each subject wore a head mounted display (HMD) experienced behavior for evacuation in a virtual underground mall developed in this study. Mobile history etc. of each subject were recorded and a questionnaire survey was conducted at the same time to grasp the reasons that the subjects moved in the virtual space, and the relationships between exit choices and the reasons were organized. The occupant density (high, medium, low) were set and the combinations of four positions and two directions of the subjects at the start of evacuation were done as the experimental conditions. A series of the experiments had shown that 1) there was a potential for using a VR escape simulator for evacuation drill in public facilities such as underground malls, 2) the start position and the direction of each subject and the occupant density had effects on their decision of moving direction and exit choice, and 3) the ratios of their decision were varied based on their conditions. And, we could consider improvement plans of the VR escape simulator.
{"title":"Consideration of Improvement of VR Evacuation Simulator through Behavior Experiment","authors":"Toshinari Tanaka, Seong-Jeong Park, M. Mizuno","doi":"10.5136/LIFESUPPORT.32.90","DOIUrl":"https://doi.org/10.5136/LIFESUPPORT.32.90","url":null,"abstract":"The purpose of this study is to investigate characteristics of exit choice during evacuation in underground mall fire using virtual reality (VR) escape simulator in cooperation with thirty subjects. Each subject wore a head mounted display (HMD) experienced behavior for evacuation in a virtual underground mall developed in this study. Mobile history etc. of each subject were recorded and a questionnaire survey was conducted at the same time to grasp the reasons that the subjects moved in the virtual space, and the relationships between exit choices and the reasons were organized. The occupant density (high, medium, low) were set and the combinations of four positions and two directions of the subjects at the start of evacuation were done as the experimental conditions. A series of the experiments had shown that 1) there was a potential for using a VR escape simulator for evacuation drill in public facilities such as underground malls, 2) the start position and the direction of each subject and the occupant density had effects on their decision of moving direction and exit choice, and 3) the ratios of their decision were varied based on their conditions. And, we could consider improvement plans of the VR escape simulator.","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117345844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.5136/LIFESUPPORT.32.46
Ryo Okamoto, Akihiko Tsukahara, F. Miyawaki
Dislodgement of a blood-access needle during hemodialysis can cause massive bleeding. To prevent the dislodgment, we developed a wired device using two types of strain gauges and examined whether it was capable of detecting a dangerous action leading to needle dislodgment. One of the two strain gauges was attached to the tape for fixing a needle normally on the skin and the other one on the tape to fix a connecting tube by a taping method termed ‘omega fixing’. Ten volunteers repeated the following task three times. The task was composed of the three consecutive actions: 1) keeping the arm still for 2 minutes, 2) keep themselves relaxed for 2 minutes and 3) performing a one-minute dangerous action causing needle dislodgment after one-minute still state. A statistically significant difference in strain was observed between the dangerous action and the other two. We found that an appropriate threshold in strain enabled detection of the dangerous action at a low significance level, for example 1.5% in this study, although a clear cut-off strain value that distinguished the dangerous action from the others was not found. Then, to systemize the device for IoT, we developed a wireless system and verified that it functioned equally to the wired system.
{"title":"Basic Study on Development of Device Using Strain Gauges to Prevent Dislodgement of a Blood-Access Needle During Hemodialysis Therapy and Its Systemization for Internet of Things","authors":"Ryo Okamoto, Akihiko Tsukahara, F. Miyawaki","doi":"10.5136/LIFESUPPORT.32.46","DOIUrl":"https://doi.org/10.5136/LIFESUPPORT.32.46","url":null,"abstract":"Dislodgement of a blood-access needle during hemodialysis can cause massive bleeding. To prevent the dislodgment, we developed a wired device using two types of strain gauges and examined whether it was capable of detecting a dangerous action leading to needle dislodgment. One of the two strain gauges was attached to the tape for fixing a needle normally on the skin and the other one on the tape to fix a connecting tube by a taping method termed ‘omega fixing’. Ten volunteers repeated the following task three times. The task was composed of the three consecutive actions: 1) keeping the arm still for 2 minutes, 2) keep themselves relaxed for 2 minutes and 3) performing a one-minute dangerous action causing needle dislodgment after one-minute still state. A statistically significant difference in strain was observed between the dangerous action and the other two. We found that an appropriate threshold in strain enabled detection of the dangerous action at a low significance level, for example 1.5% in this study, although a clear cut-off strain value that distinguished the dangerous action from the others was not found. Then, to systemize the device for IoT, we developed a wireless system and verified that it functioned equally to the wired system.","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134242970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.5136/LIFESUPPORT.32.60
Eri Nishi, T. Niikawa
The purpose of this study is to examine the variation when the same subject cooked the same dish multiple times. The ingredients and seasonings automatic measurement system consists of an electronic balance, food tables equipped with a built-in optical sensor, a sensor to measure the strength of the flame, an IH cooker, a data acquisition system, and a personal computer. Information such as food ingredients, the timing of when the ingredients are cooked, the quantities of the ingredients, and the strength of flame are recorded after cooking. Based on the information, nutritional values are calculated in real-time and saved as a comma-separated values (CSV) file. As a result of the measurement using the system, the amount of ingredients and seasonings used and the nutritional values varied in the three subjects. The necessity of measurement was shown quantitatively even if an experienced subject with long cooking experience. In particular, subjects who cooked less frequently showed larger variation when using liquid seasonings.
{"title":"Measurement of the Quantity of Ingredients and Seasonings during Home Cooking","authors":"Eri Nishi, T. Niikawa","doi":"10.5136/LIFESUPPORT.32.60","DOIUrl":"https://doi.org/10.5136/LIFESUPPORT.32.60","url":null,"abstract":"The purpose of this study is to examine the variation when the same subject cooked the same dish multiple times. The ingredients and seasonings automatic measurement system consists of an electronic balance, food tables equipped with a built-in optical sensor, a sensor to measure the strength of the flame, an IH cooker, a data acquisition system, and a personal computer. Information such as food ingredients, the timing of when the ingredients are cooked, the quantities of the ingredients, and the strength of flame are recorded after cooking. Based on the information, nutritional values are calculated in real-time and saved as a comma-separated values (CSV) file. As a result of the measurement using the system, the amount of ingredients and seasonings used and the nutritional values varied in the three subjects. The necessity of measurement was shown quantitatively even if an experienced subject with long cooking experience. In particular, subjects who cooked less frequently showed larger variation when using liquid seasonings.","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122534540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.5136/LIFESUPPORT.32.53
Akie Tamaki, Takashi Handa, Hiroyuki Suzuki, Tomohisa Shiraishi, Yoshihiko Kozai, Y. Kito, A. Hanafusa
In Japan, the number of total knee arthroplasties (TKA) has been increasing as the society is progressively aging. TKA is an operation consisting in removing the damaged surface of a patient ’ s knee joint and implanting an artificial one. The implantation angle of the artificial knee joint depends on the mechanical axis crossing the hip joint of the patient. However, it ’ s difficult for medical doctors to accurately visualize a patient ’ s mechanical axis in a clinical setting during the operation. Because the existing systems that can estimate the mechanical axis present several disadvantages such as cost, size, and complexity, they have not been widely used. The aim of this research is to develop a simple and low cost system to estimate a patient ’ s mechanical axis in a clinical setting. A three-axis inertial measurement unit (IMU) is attached to the bone cutting guide. When the femur is swung, either horizontally or vertically, the angular difference in roll, pitch and yaw is proportional to the angular difference between the mechanical and sensor ’ s axis. From this, the angular difference between mechanical and sensor ’ s axis can be calculated. In our experiments, the angular differences were 0°, , , and , with calculated angle errors below 1.0 . These results indicate the effectiveness of our system
{"title":"Mechanical Axis Estimation System for Total Knee Arthroplasty Using a Three-Axis Inertial Measurement Unit Sensor","authors":"Akie Tamaki, Takashi Handa, Hiroyuki Suzuki, Tomohisa Shiraishi, Yoshihiko Kozai, Y. Kito, A. Hanafusa","doi":"10.5136/LIFESUPPORT.32.53","DOIUrl":"https://doi.org/10.5136/LIFESUPPORT.32.53","url":null,"abstract":"In Japan, the number of total knee arthroplasties (TKA) has been increasing as the society is progressively aging. TKA is an operation consisting in removing the damaged surface of a patient ’ s knee joint and implanting an artificial one. The implantation angle of the artificial knee joint depends on the mechanical axis crossing the hip joint of the patient. However, it ’ s difficult for medical doctors to accurately visualize a patient ’ s mechanical axis in a clinical setting during the operation. Because the existing systems that can estimate the mechanical axis present several disadvantages such as cost, size, and complexity, they have not been widely used. The aim of this research is to develop a simple and low cost system to estimate a patient ’ s mechanical axis in a clinical setting. A three-axis inertial measurement unit (IMU) is attached to the bone cutting guide. When the femur is swung, either horizontally or vertically, the angular difference in roll, pitch and yaw is proportional to the angular difference between the mechanical and sensor ’ s axis. From this, the angular difference between mechanical and sensor ’ s axis can be calculated. In our experiments, the angular differences were 0°, , , and , with calculated angle errors below 1.0 . These results indicate the effectiveness of our system","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128427812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"2020年度定時社員総会議事録","authors":"","doi":"10.2497/jjspm.67.354","DOIUrl":"https://doi.org/10.2497/jjspm.67.354","url":null,"abstract":"","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133095282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-31DOI: 10.5136/lifesupport.32.2
{"title":"住宅内スキップフロアを想定した段差における昇降動作分析に関する研究","authors":"","doi":"10.5136/lifesupport.32.2","DOIUrl":"https://doi.org/10.5136/lifesupport.32.2","url":null,"abstract":"","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121139989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-31DOI: 10.5136/lifesupport.32.8
{"title":"意匠性の高い背屈支援シューズの開発","authors":"","doi":"10.5136/lifesupport.32.8","DOIUrl":"https://doi.org/10.5136/lifesupport.32.8","url":null,"abstract":"","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116252015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-31DOI: 10.5136/lifesupport.32.26
{"title":"補助人工心臓における表面粗さと発熱が溶血に及ぼす影響に関する研究","authors":"","doi":"10.5136/lifesupport.32.26","DOIUrl":"https://doi.org/10.5136/lifesupport.32.26","url":null,"abstract":"","PeriodicalId":205631,"journal":{"name":"Journal of Life Support Engineering","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134441965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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