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Requirements changes frequently occur at any time of a software development process and their management is a crucial issue to develop software of high quality. Meanwhile, recently goal-oriented analysis techniques are being put into practice to elicit requirements. In this situation, the change management of goal graphs and its support is necessary. This(More)
This paper proposes a systematic approach to derive feature models required in a software product line development. In our approach, we use goal graphs constructed by goal-oriented requirements analysis. We merge multiple goal graphs into a graph, and then regarding the leaves of the merged graph as the candidates of features, identify their commonality and(More)
The visual orienting behaviour towards prey in the free-moving mantis was investigated with a high-speed camera. The orienting behaviour consisted of head, prothorax, and abdomen rotations. Coordinated movements of these body parts in the horizontal plane were analysed frame-by-frame. Rotations of these body parts were initiated with no or slight (≤40 ms)(More)
Various non-viral delivery systems for small interfering RNAs (siRNA) have been developed. Such delivery systems generally exhibit tightly formed spherical structures. While such carriers have demonstrated good transfection activity in mono-layered cell systems, effects against solid tumors are often less apparent and difficult to demonstrate, likely due to(More)
In the fixed factor model for factor analysis (FA), common factor scores are treated as fixed parameters. However, they cannot be estimated jointly with the other parameters, since the maximum likelihood (ML) for the model diverges to infinity. In order to avoid the divergence so that all parameters can be jointly estimated, we propose a constrained fixed(More)
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