Hiroshi Yajima

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This paper presents a neural network model for technical analysis of stock market, and its application to a buying and selling timing prediction system for stock index. When the numbers of learning samples are uneven among categories, the neural network with normal learning has the problem that it tries to improve only the prediction accuracy of most(More)
Treatment of congenital pseudarthrosis of the tibia (CPT) remains a challenge. To clarify the current situation in treatment, a multicenter study was carried out to obtain information on the results of CPT treatment. The objective of this study was to propose appropriate treatment guidelines for CPT. Records of 73 patients with CPT who underwent surgical(More)
Along with the progress of our information society, various risks are becoming increasingly common, causing multiple social problems. For this reason, risk communications for establishing consensus among stakeholders who have different priorities have become important. However, it is not always easy for the decision makers to agree on measures to reduce(More)
BACKGROUND/AIMS The aims of this study were to define CA19-9-producing gastric cancer and investigate its clinicopathological features. METHODOLOGY Twenty-three patients showing high preoperative serum CA19-9 levels (> or = 38 U/mL) were enrolled in this retrospective cohort study. The CA19-9 cut-off level was determined on the basis of receiver operating(More)
The aim of this study was to analyze the reasons and risk factors for intraoperative conversion from laparoscopic cholecystectomy to open cholecystectomy. The study involved 407 patients in whom laparoscopic cholecystectomy was planned between January 1998 and July 2006. The patients were divided into two groups (the LC completed group and the conversion(More)
The large-scale and complicated information systems make it difficult to prevent or recover the failures by IT(Information Technology) risks. This paper reports an application of IT risk management to the business continuity. According to our survey, changes of information systems cause new IT risks. So, we propose an IT risk management framework by change(More)