Takeshi Nagano

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BACKGROUND Magnetic compression anastomosis (MCA) is a revolutionary, minimally invasive method of performing choledochoenterostomy or choledochocholedochostomy without using surgical techniques in patients with biliary stricture or obstruction. Herein, we describe a case series of MCA for severe biliary stricture or obstruction, which could not be treated(More)
This paper describes an outline of a project for developing a VoIP codec that can be used under a very severe communication environment where half of the packets drop. The codec is based on G.729 CS-ACELP, and a packet loss concealment (PLC) methods with redundant information will be used for enhancing speech quality. First, we assessed the importance of(More)
There are controversies regarding the extent of lymphadenectomy necessary during the course of esophagectomy for submucosal esophageal cancer. The purpose of this study was to examine the long-term outcomes after esophagectomy with extended lymphadenectomy in patients with submucosal esophageal cancer and to investigate the prognostic factors in these(More)
BACKGROUND Photodynamic therapy (PDT) has been found to be safe and effective in patients with small early esophageal squamous cell carcinoma (SCC). However, its efficacy for widespread superficial SCC has not yet been confirmed. OBJECTIVE To assess the long-term survival, complications, and recurrence of PDT for large superficial esophageal SCC. DESIGN(More)
The objective of this study was to compare the effects of two types of enteral supplements, an antioxidant-enriched enteral nutrition (AeEN) and an immune-enhancing enteral nutrition (IeEN), on the nutrition, immunoinflammatory response, antioxidant capacity and clinical outcomes in patients after esophagectomy for cancer. Patients (n = 20) undergoing(More)
We conducted a subjective evaluation experiment for VoIP speech under severe packet loss condition. The target codec was G.729, and four packet loss concealment methods were tested: parameter redundancy, SVM-based parameter redundancy, N-gram-based parameter estimation and interleaving. We first evaluated the effect of the interleaving block length on the(More)
A case of esophageal stricture with Barrett’s esophagus after total gastrectomy is reported herein. A 72-year-old woman was referred to our hospital because of dysphagia due to a stricture in the esophagus for 5 years. She had earlier undergone total gastrectomy followed by Billroth II reconstruction consequent to a gastric ulcer at the age of 49 years. She(More)
In a VoIP application, packet losses degrade speech quality. Especially, IP network under a large-scale disaster should cause severe packet losses. We have investigated the relationship between parameter loss and speech quality for G.729 codec. In this paper, we propose packet loss recovery method under severe packet loss condition, where the relationship(More)