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Analysis of Revision Surgery of Microsurgical Lumbar Discectomy
Taku Inada,Sei Nishida,Taigo Kawaoka,Toshiyuki Takahashi,Junya Hanakita 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.1
Study Design: A retrospective study. Purpose: Our objectives were to determine the association between the pathological changes of disc herniation and the interval between primary and revision surgeries and to investigate the frequency and site of the dural laceration in the primary and revision surgeries. Overview of Literature: Among 382 patients who underwent microsurgical lumbar discectomy, we investigated 29 who underwent revision surgery to analyze recurrent herniation pathologies and complications to determine the manner in which lumbar disc herniation can be more efficiently managed. Methods: Of 29 patients, 22 had recurrent disc herniation at the same level and site. The pathological changes associated with compression factors were classified into the following two types depending on intraoperative findings: (1) true recurrence and (2) minor recurrence with peridural fibrosis (>4 mm thickness). The sites of dural laceration were examined using video footage and operative records. Results: The pathological findings and days between the primary and revision surgeries showed no statistical difference (p =0.14). Analysis of multiple factors, revealed no significant difference between the primary and revision surgery groups with regard to hospital days (p =0.23), blood loss (p =0.99), and operative time (p =0.67). Dural lacerations obviously increased in the revision surgery group (1.3% vs. 16.7%, p <0.01) and were mainly located near the herniated disc in the primary surgery group and near the root shoulder in the revision surgery group, where severe fibrosis and adhesion were confirmed. To avoid dural laceration during revision surgery, meticulous decompressive manipulation must be performed around the root sleeve. Conclusions: We recommend that meticulous epidural dissection around the scar formation must be performed during revision surgery to avoid complications.
Development of a Multi-Channel Processing Matched Filter Using FPGA for CDMA-QAM Method
Hiroshi Mochizuki,Sei Takahashi,Hideo Nakamura,Satoshi Nishida,Ryo Ishikawa 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
At present, we attempt to apply our proposed CDMA-QAM method to railway signaling, and evaluate basic characteristics using computer simulation. In this paper, we describe development of a multichannel processing matched lter as a CDMA receiver. We noted that Walsh code is 1 or -1, and proposed the design that has no multipliers. In addition, we applied some techniques such as time-sharing processing, and optimized the design to reduce number of logic elements that an FPGA has. As a result, we show that we could implement the multi-channel processing matched lter in an FPGA.
Hiroshi Mochizuki,Sei Takahashi,Hideo Nakamura,Satoshi Nishida,Ryo Ishikawa 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we propose a new modulation method combining code-division multiple access (CDMA) and quadrature amplitude modulation (QAM), called CDMAQAM. It transmits QAM symbols allocated based on a CDMA signal, and it has the benefit that QAM errors can be recovered if they are in a range where they can be absorbed by CDMA demodulation. We applied the method to railway signaling and developed a CDMA-QAM rail transmission system having a transmission speed of 1500 bps using digital signal processors. We also conducted a field experiment using an actual rail and verified that the system can achieve favorable constellation characteristics.
Lee, Yoo-Won,Miyashita, Kazushi,Nishida, Tsutomu,Harada, Sei-Ichiro,Mukai, Tohru,Iida, Kohji 한국수산학회 2002 Fisheries and Aquatic Sciences Vol.5 No.3
The aim of this study was to obtain the basic data on the fish school behavior change to approaching vessel and fish species identification by means of their swimming speed. The surveys were carried out for the juvenile southern bluefin tuna and other fish schools off Esperance, western Australia from January to March 1999. We observed changes of fish school behavior in response to the approaching vessel using 360-degree scanning sonar. The results showed that, a horizontal direction index used to quantify a change of fish school behavior did not identify dependence of a radial distance and a swimming speed. A Mann-Whitney test conducted using the horizontal swimming speed of both species identified by sonar specialists, did not reveal a significant difference.