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REDUCTION OF PREVIEW DISTANCE IN LANE-KEEPING CONTROL
Keisuke Kazama,Kohei Nishizaki,Yuta Shirayama,Hiroyuki Furusho,Hiroshi Mouri 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.4
Lane marker detection is indispensable for a lane-keeping-control algorithm. However, it is impossible to detect lane markers when the curvature of the lane the vehicle is travelling on is large or when there is another car in front of the vehicle with short distance. For lane marker detection, it is desirable to set a preview point close to the vehicle. Therefore, by analyzing the block diagram of driver-vehicle system, we propose a method to reduce preview distance without lane tracking performance deterioration by increasing preview points from the conventional one point to two points. Furthermore, it is revealed that driving along a corner with constant curvature without steady-state deviation and arbitrary design of tracking dynamic characteristics become possible by increasing preview points.
Satoru Kikuchi,Tetsushi Kubota,Shinji Kuroda,Masahiko Nishizaki,Shunsuke Kagawa,Hironari Kato,Hiroyuki Okada,Toshiyoshi Fujiwara 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.4
Endoscopic ultrasound (EUS)-guided transgastric drainage has been performed as a less invasive procedure for pancreatic fistulasand intra-abdominal abscesses occurring after surgery in recent years. However, there are no reports of EUS-guided transgastricdrainage of intra-abdominal abscesses following gastrectomy. This case report describes 2 patients who developed an intra-abdominalabscess following gastrectomy and underwent EUS-guided transgastric drainage. Both patients underwent laparoscopy-assisted distalgastrectomy with Billroth-I reconstruction for gastric cancer. The intra-abdominal abscesses were caused by postoperative pancreaticfistula that developed following gastrectomy. One patient underwent naso-cystic drainage and the other underwent only a needlepuncture of the abscess cavity. EUS-guided drainage was performed safely and effectively, although 1 patient developed gastroduodenalanastomotic leakage related to this procedure. In summary, EUS-guided transgastric drainage is safe and technically feasible evenin post-gastrectomy patients. However, it is necessary to be careful if this procedure is performed in the early period followinggastrectomy.
Ship-to-Ship Radiocommunication Trial by Using Wireless LAN
Yasuyuki NIWA,Hisaya MOTOGI,Chihiro NISHIZAKI,Misako URAKAMI,Takahiro SETA,Mitsuru KOBAYASHI,Makiko MINAMI 국제이네비해양경제학회 2015 International Journal of e-Navigation and Maritime Vol.3 No.1
Seamless transfer of electronic information/data between ship-to-shore and vice versa and between ship-to-ship and shore-to-shore is being developed in the IMO e-Navigation strategy implementation plan (SIP). We have been focused on wireless LAN for ship-to-ship radiocommunication. In a former field radiocommunication trial, omni-directional antennas were used and a few hundred kbps throughput between two ships was measured, which was not enough for our research target (over 1Mbps). In order to get faster throughput, a field radiocommunication trial was carried out again with a few types of directional antennas and RSSI (Received Signal Strength Indication) and the throughput between two ships was measured simultaneously. As a result, multi-path (2-path) model affected by the reflection of the sea surface was confirmed and also the characteristics of the directional antennas such as half-power angle were confirmed, but the measured throughput was fast enough to meet our expectation.