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Minimum duration for presenting tactile stimuli to perceive stimulus locations on the palm
Kazuki Sakai,Kentaro Kotani,Satoshi Suzuki,Takafumi Asao 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
The duration for presenting tactile stimuli to generate certain images are important for developing tactile displays with effective information processing since such duration affects human short term memory, which determine accurate and effective perception for tactile information. In this study the experiment was conducted to obtain the duration required for generating spatial images from tactile stimuli. A total of five subjects participated in the experiment, where they performed two-point discrimination task with tactile stimuli ranging from 100ms to 300ms of stimulus duration. As a result, less than 200ms of duration lowered the performance of two-point differential threshold when two consecutive stimuli were given without inter-stimulus intervals. These results implied that less than 200ms of duration was not enough for identifying spatial information associated with tactile stimuli. The quantitative data obtained in this study give some insight for developing a mental model for identifying tactile spatial information.
Minimum Duration for Presenting Tactile Stimuli to Perceive Stimulus Locations on the Palm
( Kazuki Sakai ),( Kentaro Kotani ),( Satoshi Suzuki ),( Takafumi Asao ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
The duration for presenting tactile stimuli to generate certain images are important for developing tactile displays with effective information processing since such duration affects human short term memory, which determine accurate and effective perception for tactile information. In this study the experiment was conducted to obtain the duration required for generating spatial images from tactile stimuli. A total of five subjects participated in the experiment, where they performed two-point discrimination task with tactile stimuli ranging from 100ms to 300ms of stimulus duration. As a result, less than 200ms of duration lowered the performance of two-point differential threshold when two consecutive stimuli were given without inter-stimulus intervals. These results implied that less than 200ms of duration was not enough for identifying spatial information associated with tactile stimuli. The quantitative data obtained in this study give some insight for developing a mental model for identifying tactile spatial information.
Method of Determining Future Facility Location with Maintaining Present Accessibility
Wataru Takahagi,Yasushi Sumitani,Hirotaka Takahashi,Yuto Omae,Kazuki Sakai 대한산업공학회 2016 Industrial Engineeering & Management Systems Vol.15 No.3
The public services closely related to the daily lives of the Japanese people, such as firefighting, police or primary school education, are largely financed by the local governments. As the population as a whole in Japan declines, the population in local regions are forecasted to experience particularly rapid decline in the future, and it is inevitable to reduce the cost of public services provided by the local governments to keep their financial basis sustainable. In order to provide public services to the people properly and fairly, the local governments own and utilize their public facilities, such as fire stations, police stations or primary schools. On the other hand, we have to secure the accessibility, which is the condition of accessing a facility easily in a whole local city including the high population density area and low population density area. In this paper, we propose a method of determining the number of future facilities and its facility locations in which we maintain the present accessibility. In our proposed method, we determine them comparing the accessibility measurement calculated by facility location model using the present and future population. We adopted k-centdian model as the facility location model, which can secure the accessibility in a whole local city determining the weights of both areas. We applied our proposed method to fire station in Iwaki city, Japan. The results suggested that 7 facilities would be reduced in 2064, after 50 years from 2014. Additionally, we confirmed that the future facility location had securedaccessibility in both high and low population density area.
Method of Determining Future Facility Location with Maintaining Present Accessibility
Takahagi, Wataru,Sumitani, Yasushi,Takahashi, Hirotaka,Omae, Yuto,Sakai, Kazuki Korean Institute of Industrial Engineers 2016 Industrial Engineeering & Management Systems Vol.15 No.3
The public services closely related to the daily lives of the Japanese people, such as firefighting, police or primary school education, are largely financed by the local governments. As the population as a whole in Japan declines, the population in local regions are forecasted to experience particularly rapid decline in the future, and it is inevitable to reduce the cost of public services provided by the local governments to keep their financial basis sustainable. In order to provide public services to the people properly and fairly, the local governments own and utilize their public facilities, such as fire stations, police stations or primary schools. On the other hand, we have to secure the accessibility, which is the condition of accessing a facility easily in a whole local city including the high population density area and low population density area. In this paper, we propose a method of determining the number of future facilities and its facility locations in which we maintain the present accessibility. In our proposed method, we determine them comparing the accessibility measurement calculated by facility location model using the present and future population. We adopted k-centdian model as the facility location model, which can secure the accessibility in a whole local city determining the weights of both areas. We applied our proposed method to fire station in Iwaki city, Japan. The results suggested that 7 facilities would be reduced in 2064, after 50 years from 2014. Additionally, we confirmed that the future facility location had secured accessibility in both high and low population density area.
Hiroaki Kusunose,Shinsuke Koshita,Yoshihide Kanno,Takahisa Ogawa,Toshitaka Sakai,Keisuke Yonamine,Kazuaki Miyamoto,Fumisato Kozakai,Hideyuki Anan,Kazuki Endo,Haruka Okano,Masaya Oikawa,Takashi Tsuchiy 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.3
Background/Aims: This study aimed to clarify the efficacy and safety of pancreatic duct lavage cytology combined with a cell-block method (PLC-CB) for possible pancreatic ductal adenocarcinomas (PDACs). Methods: This study included 41 patients with suspected PDACs who underwent PLC-CB mainly because they were unfit for undergoing endoscopic ultrasonography-guided fine needle aspiration. A 6-Fr double lumen catheter was mainly used to perform PLC-CB. Final diagnoses were obtained from the findings of resected specimens or clinical outcomes during surveillance after PLC-CB. Results: Histocytological evaluations using PLC-CB were performed in 87.8% (36/41) of the patients. For 31 of the 36 patients, final diagnoses (invasive PDAC, 12; pancreatic carcinoma in situ, 5; benignancy, 14) were made, and the remaining five patients were excluded due to lack of surveillance periods after PLC-CB. For 31 patients, the sensitivity, specificity, and accuracy of PLC-CB for detecting malignancy were 94.1%, 100%, and 96.8%, respectively. In addition, they were 87.5%, 100%, and 94.1%, respectively, in 17 patients without pancreatic masses detectable using endoscopic ultrasonography. Four patients developed postprocedural pancreatitis, which improved with conservative therapy. Conclusions: PLC-CB has an excellent ability to detect malignancies in patients with possible PDACs, including pancreatic carcinoma in situ.