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OBJECTIVE The purpose of this study is to elucidate the usefulness of magnetic resonance imaging (MRI) and positron emission tomography (PET) for the detection of parametrial involvement and lymph node metastasis in patients with cervical cancer. METHODS Thirty-six patients with cervical cancer were retrospectively enrolled. MRI and PET scans were… (More)
T his paper examines the conditions under which exploration of a new, incompatible technology is conducive to firm growth in the presence of network externalities. In particular, this study is motivated by the divergent evolutions of the PC and the workstation markets in response to a new technology: reduced instruction set computing (RISC). In the PC… (More)
Resource allocation between exploration of emerging technological possibilities and exploitation of known technological possibilities involves a delicate trade-off. We develop a model to represent this trade-off under the time-pressing situation where the firmÕs existing basis of survival is constantly challenged by competitorsÕ innovation and imitation. We… (More)
Working paper. Comments are most welcome. Several people provided valuable suggestions in various stages of this project. Special thanks to and the anonymous reviewers for many helpful ideas. We also thank Jim Hirabayashi from the U.S. Patent and Trademark Office and several executives and engineers from the robotics industry for their time and valuable… (More)
New phenothiazine-based organic dyes with two anchoring groups at 3,7 positions and systematic alkyl chains on nitrogen were prepared. Their TiO(2)-Pt composites showed excellent photo-catalytic activities in visible light-induced water splitting. Interestingly, phenothiazine dyes with longer alkyl chains showed better stability in catalytic systems.
Recently large-scale cascading failures in complex systems have garnered substantial attention. Such extreme events have been treated as an integral part of self-organized criticality (SOC). Recent empirical work has suggested that some extreme events systematically deviate from the SOC paradigm, requiring a different theoretical framework. We shed… (More)