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Study on Effectiveness of Active Safety Devices on Low Friction Road Using Driving Simulator
Yoshimichi Terashima,Yuya Ishizaki,Ryuzo Hayashi,Pongsathorn Raksincharoensak,Masao Nagai 한국자동차공학회 2008 한국자동차공학회 Symposium Vol.2008 No.9
In recent years, various active safety devices have been developed for the prevention of accidents such as rear-end collision and skidding. The representative device for the collision prevention is the forward collision warning system, and the one for the stability control is the direct yaw-moment control (DYC) system using distributed braking forces. In this study, we aim to evaluate the performance of these devices by experiments using driving simulator reconducting critical and dangerous driving situations. Regarding the forward collision warning system, we propose a new algorithm of warning system adapted to road condition, and conduct experiments to verify its effectiveness with the driving simulator. The results of the experiment indicate that the proposed system is more effective than the conventional system. Regarding the DYC, we develop a DYC system for the driving simulator to verify the effectiveness of DYC on low friction road, including human driver in the closed-loop evaluation. The DYC algorithm is designed by model-matching control method. From the results of the experiment of obstacle avoidance, it reveals that the DYC system is very effective to stabilize the vehicle on low friction road.
( Yoshiki Hirooka ),( Akihiro Itoh ),( Hiroki Kawashima ),( Eizaburo Ohno ),( Yuya Itoh ),( Yosuke Nakamura ),( Takeshi Hiramatsu ),( Hiroyuki Sugimoto ),( Hajime Sumi ),( Daijiro Hayashi ),( Naoki Oh 대한소화기학회 2013 Gut and Liver Vol.7 No.4
Background/Aims: To confirm the feasibility of using newly developed endoscopic ultrasound (EUS) with Zone sonographyTM technology (ZST; Fujifilm Corp.). Methods: Seventy-five patients with pancreatic disorders were enrolled: 45 with intraductal papillary mucinous neoplasm; 15 with ductal carcinoma; five with neuroendocrine tumors; three with serous cystic neoplasms; and seven with simple cysts. The endoscopes used were EG-530UR2 and EG-530UT2 (Fujifilm Corp.). Two items were evaluated: visualization depth among four frequencies and image quality after automatic adjustment of sound speed (AASS), assessed using a 5-scale Likert scale by two endosonographers blinded to disease status. Because sound speed could be manually controlled, besides AASS, image quality at sound speeds of 1,440 and 1,600 m/sec were also assessed. Results: In all cases, sufficient images were obtained in the range of 3 cm from the EUS probe. Judgments of image quality before AASS were 3.49 0.50, 3.65±0.48, respectively. After AASS, A and B scored 4.36±0.48 and 4.40±0.49 (p<0.0001). There were significant differences in the data before and after AASS and plus 60 m/sec, but no significant difference between the datasets were seen after AASS and at sound speeds manually set for minus 100 m/sec. Conclusions: EUS with ZST was shown to be feasible in this preliminary experiment. Further evaluation of this novel technology is necessary and awaited. (Gut Liver 2013; 7:486-491)