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Daisuke Hashimoto,Takaomi Okawa,Fujio Matsumura 한국간담췌외과학회 2019 Annals of hepato-biliary-pancreatic surgery Vol.23 No.2
Backgrounds/Aims: A board certification system has been established by the Japanese Society of Hepato-Biliary-Pancreatic Surgery (JSHBPS) for certifying surgeons who can perform high-level hepato-biliary-pancreatic surgeries safely. The aim of this study was to compare operative outcomes after pancreaticoduodenectomy performed by trainees, board-certified instructors, and expert surgeons of JSHBPS to determine the efficacy of education of trainees and operative safety. Methods: From 2009 to 2017, 225 consecutive patients underwent pancreaticoduodenectomy. Operations were performed by trainees, instructors, or JSHBPS experts. Clinical course and postoperative outcomes were retrospectively evaluated. Results: Twenty-two surgeons performed pancreaticoduodenectomy and two became expert surgeons. First, data of all patients who underwent pancreaticoduodenectomy (n=225) were analyzed. Significantly shorter median operating time and less median operative bleeding were documented in the experts’ group (428 min, 576 g, respectively) than in the trainees’ (498.5 min, 818 g, respectively) and instructors’ (557 min, 911 g, respectively) groups. Morbidity did not differ significantly between the three groups. Second, data of patients who underwent simple pancreaticoduodenectomy (n=130) were analyzed. Similarly, operating time was shorter and operative bleeding less in the experts’ group. With increasing their experiences, intraoperative bleeding by 2 surgeons became the expert surgeons decreased. Conclusions: Surgeons judged experts by the JSHBPS board certification system achieve significantly shorter operating time and less operative bleeding during pancreaticoduodenectomy. In addition, PD performed by trainees has an acceptable incidence of postoperative complications. This is the first report which indicated the efficacy of education toward being the JSHPBS board-certified expert surgeon.
ELB in IP/NGEO Satellite Constellations: Issues and Solutions
Mashimo, Daisuke,Taleb, Tarik,Hashimoto, Kazuo,Nemoto, Yoshiaki,Kato, Nei 통신위성우주산업연구회 2006 Joint Conference on Satellite Communications Vol.2006 No.-
To ensure an intelligent engineering of traffic over satellite networks, the authors have recently proposed a routing protocol dubbed Explicit Load Balancing (ELB). The protocol enables neighboring satellites to explicitly exchange information on their congestion status. A satellite that is about to get congested requests its neighboring satellites to decrease their data forwarding rates. In response, the neighboring satellites search for less congested paths that do not include the satellite in question and communicate a portion of data, primarily destined to the satellite, via the retrieved paths. While transmitting packets of the same flow over different links helps to better distribute the traffic over the satellite constellation, and accordingly alleviates congestion and avoids packet drops, it leads to the reception of packets in an out-of-order manner at the receiver side. In case of TCP, this phenomenon results in the transmission of duplicate acknowledgments, unnecessarily halves the congestion window of TCP, and ultimately degrades the throughput. As a remedy to this issue, we suggest that receivers refer to the Time-to-Live (TTL) field of packet headers to judge whether the out of order in the reception of packets is due to congestion or simply to changes in the communication path. Furthermore, as packets have to traverse more hops in ELB, delay-sensitive applications may get affected by the extra delay due to hops. To cope with such an issue, we consider the use of differentiated services we classify users into a number of classes, namely delay sensitive, throughput-sensitive, and best effort. Via simulations, we demonstrate the efficiency of ELB in such environments.
Drawing a Line between Literal and Idiomatic Meanings Based on Supervised WSD
( Chikara Hashimoto ),( Daisuke Kawahara ) 경희대학교 언어연구소 2008 언어연구 Vol.25 No.2
Some phrases can be interpreted either idiomatically (figuratively) or literally in context, and the precise identification of idioms is indispensable for full-fledged natural language processing (NLP). To this end, we have constructed an idiom corpus for Japanese. This paper reports on the corpus and the results of an idiom identification experiment using the corpus. The corpus targets 146 ambiguous idioms, and consists of 102,846 sentences, each of which is annotated with a literal/idiom label. For idiom identification, we targeted 90 out of the 146 idioms and adopted a word sense disambiguation (WSD) method using both common WSD features and idiom-specific features. The corpus and the experiment are the largest of their kind, as far as we know. As a result, we found that a standard supervised WSD method works well for the idiom identification and achieved an accuracy of 89.25% and 88.86% with/without idiom-specific features.
Studyon Human body Motion Interface
Sho Yokota,Hiroshi Hashimoto,Yasuhiro Ohyama,Jin-Hua SHE,Daisuke Chugo,Hisato Kobayashi,Pierre Blazevic 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The joystick is the operation interface of electric wheelchair. The user needs to operate it in accordance with machine’s operational procedure specifications. Therefore the joystick is convenience operation system for the system side rather than the user side We focus on the body motions which humans have, and tryto realize a new type of interface which replaces conventional joystick. There is a body motion which comes from in stinctive adjustment functions to control changes of body shape caused by voluntary actions. We use this kind of motion as an interface and call it HBMI(Human Body Motion Inerface). In this paper, we set a prototype based on the experiment for deriving a suitable measurement to detect human body motion. The evaluation of HBMI by using SD method is also presented.