The origin and direction of replication of the E. coli B/r chromosome has been determined by comparing gene frequencies in P1-transducing lysates prepared on cultures growing at different rates. The gene frequencies found are consistent with the idea that replication of the chromosome is dichotomous in rapidly growing B/r. The origin was found to be between 40 and 55 min on the E. coli genetic ...

This paper describes the digitization and utilization of Complete Map of Peking, Qianlong Period, which is the oldest measured map of Beijing made about 250 years ago. We first proposed the geometric correction method called “linepreserving distance weighting method” to preserve linear features relevant in the old map of cities. Next we improved the reliability of the old map as information inf...

This paper concerns pinched surfaces, also known as pseudosurfaces. A map is a graph G embedded on an oriented pinched surface. An arc of a map is an edge of G with a fixed direction. A regular map is one with a group of orientation-preserving automorphisms that acts regularly on the arcs of a map, i.e., that acts both freely and transitively. We study regular maps on pinched surfaces. We give ...

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We present new methods of automating the construction of index pairs, essential ingredients of discrete Conley index theory. These new algorithms are further steps in the direction of automating computer-assisted proofs of semiconjugacies from a map on a manifold to a subshift of finite type. We apply these new algorithms to the standard map at different values of the perturbative parameter ε a...

We propose a key-frame-based depth propagation method considering movement on the z-axis. First, a homography matrix is obtained through the feature points between points. Through this homography matrix information, a movement of objects or cameras is inferred in the direction of the z axis, thereby creating a depth map that compensates the movement. Then, bilateral filtering is executed to cre...

We describe a multi-hypothesis mapping system for mobile robots that learns graph-based topological representations. Our approach exploits direction information and the assumption of planarity to prune the space of possible map hypotheses. Qualitative spatial reasoning is used to check satisfiability of individual hypotheses. We evaluate the effects of absolute and relative direction informatio...