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Kentaro Okada,Seiji Ohtori,Gen Inoue,Sumihisa Orita,Yawara Eguchi,Junichi Nakamura,Yasuchika Aoki,Tetsuhiro Ishikawa,Masayuki Miyagi,Hiroto Kamoda,Miyako Suzuki,Gou Kubota,Yoshihiro Sakuma,Yasuhiro Oi 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.3
Study Design: Prospective study. Purpose: To examine the long-term effects of interspinous ligament injections of local anesthetics and steroids for the treatment of Baastrup’s diseases. Overview of Literature: Baastrup’s disease is associated with axial low back pains. Baastrup’s disease has been more recently described as the “kissing spinous processes” disease. Several authors have reported methods for the diagnosis and treatment of the disease. However, there has been only one report of patients receiving interspinous ligament injections of agents for the treatment of Baastrup’s disease. Methods: Seventeen patients showed severe low back pains between spinous processes at L3–L4 or L4–L5. X-ray imaging, computed tomography, and magnetic resonance imaging revealed kissing spinous processes, consolidation of spinous process, or inflammation of an interspinous ligament. Pain reliefs after lidocaine and dexamethasone administration into interspinous ligament as therapy for low back pains were being examined and followed up. Results: Low back pain scores significantly improved immediately after injection of the agents into interspinous ligaments. At final follow-up (1.4 year), low back pain scores significantly improved as compared with before the treatment. Conclusions: Findings from the current study indicate that lidocaine and dexamethasone administration into interspinous ligament in patients diagnosed with Baastrup’s disease is effective for managing the pain associated with this disease.
A Study on Cluster Lifetime in Multi-HopWireless Sensor Networks with Cooperative MISO Scheme
Huang, Zheng,Okada, Hiraku,Kobayashi, Kentaro,Katayama, Masaaki The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.4
As for cluster-based wireless sensor networks (WSNs), cluster lifetime is one of the most important subjects in recent researches. Besides reducing the energy consumptions of the clusters, it is necessary to make the clusters achieve equal lifetimes so that the whole network can survive longer. In this paper, we focus on the cluster lifetimes in multi-hop WSNs with cooperative multi-input single-output scheme. With a simplified model of multi-hop WSNs, we change the transmission schemes, the sizes and transmission distances of clusters to investigate their effects on the cluster lifetimes. Furthermore, linear and uniform data aggregations are considered in our model. As a result, we analyze the cluster lifetimes in different situations and discuss the requirements on the sizes and transmission distances of clusters for equal lifetimes.
A Study on Cluster Lifetime in Multi-HopWireless Sensor Networks with Cooperative MISO Scheme
Zheng Huang,Hiraku Okada,Kentaro Kobayashi,Masaaki Katayama 한국통신학회 2012 Journal of communications and networks Vol.14 No.4
As for cluster-based wireless sensor networks (WSNs),cluster lifetime is one of the most important subjects in recent researches. Besides reducing the energy consumptions of the clusters,it is necessary to make the clusters achieve equal lifetimes so that the whole network can survive longer. In this paper, we focus on the cluster lifetimes in multi-hop WSNs with cooperative multiinput single-output scheme. With a simplified model of multi-hop WSNs, we change the transmission schemes, the sizes and transmission distances of clusters to investigate their effects on the cluster lifetimes. Furthermore, linear and uniform data aggregations are considered in our model. As a result, we analyze the cluster lifetimes in different situations and discuss the requirements on the sizes and transmission distances of clusters for equal lifetimes.
Direct Micro-joining of Flexible Printed Circuit and Metal Electrode by Pulsed Nd:YAG Laser
Mohd Idris Shah Ismail,Yasuhiro Okamoto,Akira Okada,Yoshiyuki Uno,Kentaro Ueoka 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Laser micro-welding has proven to be a very successful tool for micro-joining in the electrical and electronic industries,where the miniaturization, the high strength and the high heat resistance are constantly requested. Recently, a flexible printed circuit (FPC) is expected as a new connection technology between electrical conductors according to the improvements of reliability and controllability with the diversification of the design concept. In this technology, it is required to weld a several tens μm thickness of FPC and a several hundreds μm thickness of metal electrode. This material combination accompanies the difficulty to control the welding phenomenon due to the differences of thermal property and heat capacity. As a good alternative, laser micro-welding has advantages of non-contact tool, low heat distortion and consistent weld integrity. In this study, the overlap welding of thin copper circuit on a polyimide film and a thick brass electrode was experimentally and numerically investigated by using a pulsed Nd:YAG laser. In addition, the shearing stress of overlap welding was evaluated with and without the control of pulse waveform, which can provide a well-directed controlling of the heat input with high energy density. The results showed that a porosity was observed as the major weld defect in the welding process without a pulse control. However, the appropriate controlled laser pulse configuration of micro-welding could remove the weld defects in the molten zone, improve the weld penetration stability and increase the weld strength. The potential benefits of controlled pulse waveform were discussed for the direct laser micro-welding process. It is clarified that the direct laser micro-welding of a thin copper circuit on a polyimide film and a thick brass electrode could be successfully achieved by appropriate controlled pulse waveform and heat input.
Yasui, Takahiro,Tozawa, Keiichi,Ando, Ryosuke,Hamakawa, Takashi,Iwatsuki, Shoichiro,Taguchi, Kazumi,Kobayashi, Daichi,Naiki, Taku,Mizuno, Kentaro,Okada, Atsushi,Umemoto, Yukihiro,Kawai, Noriyasu,Sasak Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15
Background: To explore the safety, efficacy, and oncological outcome of 3-port laparoscopic radical cystectomy (LRC) compared to open radical cystectomy (ORC) in patients older than 75 years. Materials and Methods: From June 2010 to July 2014, we analyzed 16 radical cystectomies in patients older than 75 years (LRC group=8; ORC group=8). Demographic parameters, operative variables, and perioperative outcome in the 2 groups were retrospectively collected, analyzed, and compared. Results: Patients in both groups had comparable preoperative characteristics. A significantly longer operating time (476 vs. 303 min, P=0.0002) and less estimated blood loss (627 vs. 2,106 mL, P=0.021) were observed in the LRC group compared to the ORC group. Infection and ileus were the most common early complications after surgery. Patients who underwent ORC suffered from more postoperative infection (22.2% vs. 0.0%, P=0.054) and ileus (25.0% vs. 12.5%, P=0.521) than the LRC group, but the difference was not significant. Conclusions: Judging from this initial trial, 3-port LRC can be safely carried out in elderly patients. We suggest 3-port LRC as the primary intervention to treat muscle-invasive or high-risk nonmuscle-invasive bladder cancer in elderly patients with an otherwise relatively long life expectancy.